Find the first / third / mean / fourth proportional : Practice Questions


Types of Proportional with examples Click Here


Ratio & Proportion : Practice Questions


1. Find the first proportional to 16 and 32. 16 āφ⧰⧁ 32 ā§° āĻĒā§ā§°āĻĨāĻŽ āĻ…āύ⧁āĻĒāĻžāϤāĻŋāĻ• āϏāĻ‚āĻ–ā§āϝāĻž āĻŦāĻŋāϚāĻžā§°āĻ•āĨ¤


A. 6400  B. 2100  C. 8  D. 32


2. Find the third proportional to 8 and 12. 8 āφ⧰⧁ 12 ā§° āϤ⧃āϤ⧀āϝāĻŧ āĻ…āύ⧁āĻĒāĻžāϤāĻŋāĻ• āϏāĻ‚āĻ–ā§āϝāĻž āĻŦāĻŋāϚāĻžā§°āĻ•āĨ¤


A. 14  B. 9  C. 18  D. 16


3. Find the mean proportional between 9 and 25. 9 āφ⧰⧁ 25 ā§° āĻŽāĻžāϜ⧰ āĻŽāĻ§ā§āϝ āĻ…āύ⧁āĻĒāĻžāϤāĻŋāĻ• āĻŦāĻŋāϚāĻžā§°āĻ•āĨ¤


A. 17  B. 26  C. 23  D. 15


4. Find the fourth proportional to 16, 26 and 32. 16, 26 āφ⧰⧁ 32 ā§° āϚāĻ¤ā§ā§°ā§āĻĨ āĻ…āύ⧁āĻĒāĻžāϤāĻŋāĻ• āĻŦāĻŋāϚāĻžā§°āĻ•āĨ¤


A. 23  B. 22  C. 51  D. 52


Types of Proportional with examples Click Here


Hard Level Questions: Ratio & Proportion


1. Find the third proportional to 15 and 25. (15 āφ⧰⧁ 25 ā§° āϤ⧃āϤ⧀āϝāĻŧ āĻ…āύ⧁āĻĒāĻžāϤāĻŋāĻ• āĻŦāĻŋāϚāĻžā§°āĻ•āĨ¤)


A. 30  B. 35  C. 41.67  D. 45


2. Find the mean proportional between 12 and 75. (12 āφ⧰⧁ 75 ā§° āĻŽāĻžāϜ⧰ āĻŽāĻ§ā§āϝ āĻ…āύ⧁āĻĒāĻžāϤāĻŋāĻ• āĻŦāĻŋāϚāĻžā§°āĻ•āĨ¤)


A. 20  B. 25  C. 30  D. 35


3. Find the fourth proportional to 9, 15 and 45. (9, 15 āφ⧰⧁ 45 ā§° āϚāĻ¤ā§ā§°ā§āĻĨ āĻ…āύ⧁āĻĒāĻžāϤāĻŋāĻ• āĻŦāĻŋāϚāĻžā§°āĻ•āĨ¤)


A. 60  B. 70  C. 75  D. 80


4. Find the third proportional to 18 and 27. (18 āφ⧰⧁ 27 ā§° āϤ⧃āϤ⧀āϝāĻŧ āĻ…āύ⧁āĻĒāĻžāϤāĻŋāĻ• āĻŦāĻŋāϚāĻžā§°āĻ•āĨ¤)


A. 36  B. 40.5  C. 45  D. 54


5. Find the mean proportional between 8 and 50. (8 āφ⧰⧁ 50 ā§° āĻŽāĻžāϜ⧰ āĻŽāĻ§ā§āϝ āĻ…āύ⧁āĻĒāĻžāϤāĻŋāĻ• āĻŦāĻŋāϚāĻžā§°āĻ•āĨ¤)


A. 18  B. 20  C. 25  D. 30


6. Find the fourth proportional to 7, 21 and 63. (7, 21 āφ⧰⧁ 63 ā§° āϚāĻ¤ā§ā§°ā§āĻĨ āĻ…āύ⧁āĻĒāĻžāϤāĻŋāĻ• āĻŦāĻŋāϚāĻžā§°āĻ•āĨ¤)


A. 147  B. 189  C. 210  D. 252


7. Find the third proportional to 20 and 30. (20 āφ⧰⧁ 30 ā§° āϤ⧃āϤ⧀āϝāĻŧ āĻ…āύ⧁āĻĒāĻžāϤāĻŋāĻ• āĻŦāĻŋāϚāĻžā§°āĻ•āĨ¤)


A. 40  B. 45  C. 50  D. 60


8. Find the mean proportional between 18 and 98. (18 āφ⧰⧁ 98 ā§° āĻŽāĻžāϜ⧰ āĻŽāĻ§ā§āϝ āĻ…āύ⧁āĻĒāĻžāϤāĻŋāĻ• āĻŦāĻŋāϚāĻžā§°āĻ•āĨ¤)


A. 36  B. 40  C. 42  D. 48


9. Find the fourth proportional to 11, 22 and 44. (11, 22 āφ⧰⧁ 44 ā§° āϚāĻ¤ā§ā§°ā§āĻĨ āĻ…āύ⧁āĻĒāĻžāϤāĻŋāĻ• āĻŦāĻŋāϚāĻžā§°āĻ•āĨ¤)


A. 66  B. 77  C. 88  D. 99


10. Find the third proportional to 24 and 36. (24 āφ⧰⧁ 36 ā§° āϤ⧃āϤ⧀āϝāĻŧ āĻ…āύ⧁āĻĒāĻžāϤāĻŋāĻ• āĻŦāĻŋāϚāĻžā§°āĻ•āĨ¤)


A. 48  B. 54  C. 60  D. 72


11. If a : b = 4 : 7 and b : c = 14 : 9, find a : c. (āϝāĻĻāĻŋ a : b = 4 : 7 āφ⧰⧁ b : c = 14 : 9, āϤ⧇āĻ¨ā§āϤ⧇ a : c āĻŦāĻŋāϚāĻžā§°āĻ•āĨ¤)


A. 8 : 9  B. 4 : 9  C. 16 : 9  D. 2 : 3


12. If x : y = 3 : 5 and y : z = 10 : 9, find x : z. (āϝāĻĻāĻŋ x : y = 3 : 5 āφ⧰⧁ y : z = 10 : 9, āϤ⧇āĻ¨ā§āϤ⧇ x : z āĻŦāĻŋāϚāĻžā§°āĻ•āĨ¤)


A. 2 : 3  B. 3 : 9  C. 6 : 9  D. 1 : 3


13. If a : b = 5 : 6 and b : c = 12 : 7, find a : c. (āϝāĻĻāĻŋ a : b = 5 : 6 āφ⧰⧁ b : c = 12 : 7, āϤ⧇āĻ¨ā§āϤ⧇ a : c āĻŦāĻŋāϚāĻžā§°āĻ•āĨ¤)


A. 5 : 7  B. 10 : 7  C. 15 : 7  D. 20 : 7


14. Find the mean proportional between 27 and 75. (27 āφ⧰⧁ 75 ā§° āĻŽāĻžāϜ⧰ āĻŽāĻ§ā§āϝ āĻ…āύ⧁āĻĒāĻžāϤāĻŋāĻ• āĻŦāĻŋāϚāĻžā§°āĻ•āĨ¤)


A. 35  B. 40  C. 45  D. 50


15. Find the fourth proportional to 12, 18 and 27. (12, 18 āφ⧰⧁ 27 ā§° āϚāĻ¤ā§ā§°ā§āĻĨ āĻ…āύ⧁āĻĒāĻžāϤāĻŋāĻ• āĻŦāĻŋāϚāĻžā§°āĻ•āĨ¤)


A. 36  B. 40.5  C. 45  D. 54


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Types of Proportional with examples Click Here


Very Hard Questions: Ratio & Proportion


1. If a : b = 3 : 4 and b : c = 8 : 5, find a : c. (āϝāĻĻāĻŋ a : b = 3 : 4 āφ⧰⧁ b : c = 8 : 5, āϤ⧇āĻ¨ā§āϤ⧇ a : c āĻŦāĻŋāϚāĻžā§°āĻ•āĨ¤)


A. 3 : 5  B. 6 : 5  C. 12 : 5  D. 24 : 5


2. If x : y = 2 : 3 and y : z = 9 : 4, find x : z. (āϝāĻĻāĻŋ x : y = 2 : 3 āφ⧰⧁ y : z = 9 : 4, āϤ⧇āĻ¨ā§āϤ⧇ x : z āĻŦāĻŋāϚāĻžā§°āĻ•āĨ¤)


A. 2 : 4  B. 3 : 4  C. 6 : 4  D. 2 : 1


3. The mean proportional between two numbers is 12 and one number is 9. Find the other. (āĻĻ⧁āϟāĻž āϏāĻ‚āĻ–ā§āϝāĻžā§° āĻŽāĻžāϜ⧰ āĻŽāĻ§ā§āϝ āĻ…āύ⧁āĻĒāĻžāϤāĻŋāĻ• 12 āφ⧰⧁ āĻāϟāĻž āϏāĻ‚āĻ–ā§āϝāĻž 9 āĻš’āϞ⧇ āφāύāĻŸā§‹ āϏāĻ‚āĻ–ā§āϝāĻž āĻŦāĻŋāϚāĻžā§°āĻ•āĨ¤)


A. 14  B. 15  C. 16  D. 18


4. If the third proportional to a and b is 27 and a = 9, find b. (āϝāĻĻāĻŋ a āφ⧰⧁ b ā§° āϤ⧃āϤ⧀āϝāĻŧ āĻ…āύ⧁āĻĒāĻžāϤāĻŋāĻ• 27 āφ⧰⧁ a = 9, āϤ⧇āĻ¨ā§āϤ⧇ b āĻŦāĻŋāϚāĻžā§°āĻ•āĨ¤)


A. 12  B. 15  C. 18  D. 21


5. If the fourth proportional to 6, 9 and x is 36, find x. (āϝāĻĻāĻŋ 6, 9 āφ⧰⧁ x ā§° āϚāĻ¤ā§ā§°ā§āĻĨ āĻ…āύ⧁āĻĒāĻžāϤāĻŋāĻ• 36 āĻšāϝāĻŧ, āϤ⧇āĻ¨ā§āϤ⧇ x āĻŦāĻŋāϚāĻžā§°āĻ•āĨ¤)


A. 18  B. 24  C. 27  D. 30


6. If a : b = 5 : 7 and b : c = 14 : 15, find a : c. (āϝāĻĻāĻŋ a : b = 5 : 7 āφ⧰⧁ b : c = 14 : 15, āϤ⧇āĻ¨ā§āϤ⧇ a : c āĻŦāĻŋāϚāĻžā§°āĻ•āĨ¤)


A. 5 : 15  B. 10 : 15  C. 15 : 15  D. 20 : 15


7. If x : y : z = 2 : 3 : 4 and the sum is 45, find x. (āϝāĻĻāĻŋ x : y : z = 2 : 3 : 4 āφ⧰⧁ āĻŽā§āĻ  45, āϤ⧇āĻ¨ā§āϤ⧇ x āĻŦāĻŋāϚāĻžā§°āĻ•āĨ¤)


A. 5  B. 10  C. 15  D. 20


8. If two numbers are in the ratio 4 : 9 and their product is 576, find the numbers. (āĻĻ⧁āϟāĻž āϏāĻ‚āĻ–ā§āϝāĻž 4 : 9 āĻ…āύ⧁āĻĒāĻžāϤāϤ āφāϛ⧇ āφ⧰⧁ āϗ⧁āĻŖāĻĢāϞ 576, āϤ⧇āĻ¨ā§āϤ⧇ āϏāĻ‚āĻ–ā§āϝāĻž āĻĻ⧁āϟāĻž āĻŦāĻŋāϚāĻžā§°āĻ•āĨ¤)


A. 12, 27  B. 16, 36  C. 18, 32  D. 24, 24


9. If a : b = 2 : 5 and b : c = 10 : 3, find a : b : c. (āϝāĻĻāĻŋ a : b = 2 : 5 āφ⧰⧁ b : c = 10 : 3, āϤ⧇āĻ¨ā§āϤ⧇ a : b : c āĻŦāĻŋāϚāĻžā§°āĻ•āĨ¤)


A. 2 : 5 : 3  B. 4 : 10 : 3  C. 2 : 10 : 3  D. 4 : 5 : 3


10. If the mean proportional between a and b is 20 and a = 5, find b. (āϝāĻĻāĻŋ a āφ⧰⧁ b ā§° āĻŽāĻžāϜ⧰ āĻŽāĻ§ā§āϝ āĻ…āύ⧁āĻĒāĻžāϤāĻŋāĻ• 20 āφ⧰⧁ a = 5, āϤ⧇āĻ¨ā§āϤ⧇ b āĻŦāĻŋāϚāĻžā§°āĻ•āĨ¤)


A. 60  B. 70  C. 80  D. 100


11. If the ratio of two numbers is 7 : 11 and their difference is 24, find the numbers. (āĻĻ⧁āϟāĻž āϏāĻ‚āĻ–ā§āϝāĻžā§° āĻ…āύ⧁āĻĒāĻžāϤ 7 : 11 āφ⧰⧁ āĻĒāĻžā§°ā§āĻĨāĻ•ā§āϝ 24, āϤ⧇āĻ¨ā§āϤ⧇ āϏāĻ‚āĻ–ā§āϝāĻž āĻĻ⧁āϟāĻž āĻŦāĻŋāϚāĻžā§°āĻ•āĨ¤)


A. 42, 66  B. 28, 44  C. 35, 55  D. 49, 77


12. If a : b = b : c, prove that b² = ac (concept-based). (āϝāĻĻāĻŋ a : b = b : c, āĻĒā§ā§°āĻŽāĻžāĻŖ āϕ⧰āĻ• b² = acāĨ¤)


A. True  B. False  C. Depends  D. None


13. If x : y = 5 : 8 and y = 24, find x. (āϝāĻĻāĻŋ x : y = 5 : 8 āφ⧰⧁ y = 24, āϤ⧇āĻ¨ā§āϤ⧇ x āĻŦāĻŋāϚāĻžā§°āĻ•āĨ¤)


A. 10  B. 15  C. 20  D. 30


14. If three numbers are in continued proportion and the first is 4 and the third is 36, find the middle number. (āϝāĻĻāĻŋ āϤāĻŋāύāĻŋāϟāĻž āϏāĻ‚āĻ–ā§āϝāĻž āϧāĻžā§°āĻžāĻŦāĻžāĻšāĻŋāĻ• āĻ…āύ⧁āĻĒāĻžāϤāϤ āφāϛ⧇ āφ⧰⧁ āĻĒā§ā§°āĻĨāĻŽāĻŸā§‹ 4 āφ⧰⧁ āϤ⧃āϤ⧀āϝāĻŧāĻŸā§‹ 36, āϤ⧇āĻ¨ā§āϤ⧇ āĻŽāĻžāϜ⧰ āϏāĻ‚āĻ–ā§āϝāĻž āĻŦāĻŋāϚāĻžā§°āĻ•āĨ¤)


A. 10  B. 12  C. 14  D. 16


15. If a : b = 3 : 5 and b : c = 15 : 7, find a : c. (āϝāĻĻāĻŋ a : b = 3 : 5 āφ⧰⧁ b : c = 15 : 7, āϤ⧇āĻ¨ā§āϤ⧇ a : c āĻŦāĻŋāϚāĻžā§°āĻ•āĨ¤)


A. 3 : 7  B. 6 : 7  C. 9 : 7  D. 12 : 7


Types of Proportional with examples Click Here


HOTS Tip


Make common term equal (b) before solving
Always simplify ratios