Find the first / third / mean / fourth proportional : Practice Questions
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Ratio & Proportion : Practice Questions
1. Find the first proportional to 16 and 32. 16 āĻā§°ā§ 32 ā§° āĻĒā§ā§°āĻĨāĻŽ āĻ āύā§āĻĒāĻžāϤāĻŋāĻ āϏāĻāĻā§āϝāĻž āĻŦāĻŋāĻāĻžā§°āĻāĨ¤
A. 6400 B. 2100 C. 8 D. 32
2. Find the third proportional to 8 and 12. 8 āĻā§°ā§ 12 ā§° āϤā§āϤā§āϝāĻŧ āĻ āύā§āĻĒāĻžāϤāĻŋāĻ āϏāĻāĻā§āϝāĻž āĻŦāĻŋāĻāĻžā§°āĻāĨ¤
A. 14 B. 9 C. 18 D. 16
3. Find the mean proportional between 9 and 25. 9 āĻā§°ā§ 25 ā§° āĻŽāĻžāĻā§° āĻŽāϧā§āϝ āĻ āύā§āĻĒāĻžāϤāĻŋāĻ āĻŦāĻŋāĻāĻžā§°āĻāĨ¤
A. 17 B. 26 C. 23 D. 15
4. Find the fourth proportional to 16, 26 and 32. 16, 26 āĻā§°ā§ 32 ā§° āĻāϤā§ā§°ā§āĻĨ āĻ āύā§āĻĒāĻžāϤāĻŋāĻ āĻŦāĻŋāĻāĻžā§°āĻāĨ¤
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 āĻā§°ā§ 25 ā§° āϤā§āϤā§āϝāĻŧ āĻ āύā§āĻĒāĻžāϤāĻŋāĻ āĻŦāĻŋāĻāĻžā§°āĻāĨ¤)
A. 30 B. 35 C. 41.67 D. 45
2. Find the mean proportional between 12 and 75. (12 āĻā§°ā§ 75 ā§° āĻŽāĻžāĻā§° āĻŽāϧā§āϝ āĻ āύā§āĻĒāĻžāϤāĻŋāĻ āĻŦāĻŋāĻāĻžā§°āĻāĨ¤)
A. 20 B. 25 C. 30 D. 35
3. Find the fourth proportional to 9, 15 and 45. (9, 15 āĻā§°ā§ 45 ā§° āĻāϤā§ā§°ā§āĻĨ āĻ āύā§āĻĒāĻžāϤāĻŋāĻ āĻŦāĻŋāĻāĻžā§°āĻāĨ¤)
A. 60 B. 70 C. 75 D. 80
4. Find the third proportional to 18 and 27. (18 āĻā§°ā§ 27 ā§° āϤā§āϤā§āϝāĻŧ āĻ āύā§āĻĒāĻžāϤāĻŋāĻ āĻŦāĻŋāĻāĻžā§°āĻāĨ¤)
A. 36 B. 40.5 C. 45 D. 54
5. Find the mean proportional between 8 and 50. (8 āĻā§°ā§ 50 ā§° āĻŽāĻžāĻā§° āĻŽāϧā§āϝ āĻ āύā§āĻĒāĻžāϤāĻŋāĻ āĻŦāĻŋāĻāĻžā§°āĻāĨ¤)
A. 18 B. 20 C. 25 D. 30
6. Find the fourth proportional to 7, 21 and 63. (7, 21 āĻā§°ā§ 63 ā§° āĻāϤā§ā§°ā§āĻĨ āĻ āύā§āĻĒāĻžāϤāĻŋāĻ āĻŦāĻŋāĻāĻžā§°āĻāĨ¤)
A. 147 B. 189 C. 210 D. 252
7. Find the third proportional to 20 and 30. (20 āĻā§°ā§ 30 ā§° āϤā§āϤā§āϝāĻŧ āĻ āύā§āĻĒāĻžāϤāĻŋāĻ āĻŦāĻŋāĻāĻžā§°āĻāĨ¤)
A. 40 B. 45 C. 50 D. 60
8. Find the mean proportional between 18 and 98. (18 āĻā§°ā§ 98 ā§° āĻŽāĻžāĻā§° āĻŽāϧā§āϝ āĻ āύā§āĻĒāĻžāϤāĻŋāĻ āĻŦāĻŋāĻāĻžā§°āĻāĨ¤)
A. 36 B. 40 C. 42 D. 48
9. Find the fourth proportional to 11, 22 and 44. (11, 22 āĻā§°ā§ 44 ā§° āĻāϤā§ā§°ā§āĻĨ āĻ āύā§āĻĒāĻžāϤāĻŋāĻ āĻŦāĻŋāĻāĻžā§°āĻāĨ¤)
A. 66 B. 77 C. 88 D. 99
10. Find the third proportional to 24 and 36. (24 āĻā§°ā§ 36 ā§° āϤā§āϤā§āϝāĻŧ āĻ āύā§āĻĒāĻžāϤāĻŋāĻ āĻŦāĻŋāĻāĻžā§°āĻāĨ¤)
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 āĻā§°ā§ b : c = 14 : 9, āϤā§āύā§āϤ⧠a : c āĻŦāĻŋāĻāĻžā§°āĻāĨ¤)
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 āĻā§°ā§ y : z = 10 : 9, āϤā§āύā§āϤ⧠x : z āĻŦāĻŋāĻāĻžā§°āĻāĨ¤)
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 āĻā§°ā§ b : c = 12 : 7, āϤā§āύā§āϤ⧠a : c āĻŦāĻŋāĻāĻžā§°āĻāĨ¤)
A. 5 : 7 B. 10 : 7 C. 15 : 7 D. 20 : 7
14. Find the mean proportional between 27 and 75. (27 āĻā§°ā§ 75 ā§° āĻŽāĻžāĻā§° āĻŽāϧā§āϝ āĻ āύā§āĻĒāĻžāϤāĻŋāĻ āĻŦāĻŋāĻāĻžā§°āĻāĨ¤)
A. 35 B. 40 C. 45 D. 50
15. Find the fourth proportional to 12, 18 and 27. (12, 18 āĻā§°ā§ 27 ā§° āĻāϤā§ā§°ā§āĻĨ āĻ āύā§āĻĒāĻžāϤāĻŋāĻ āĻŦāĻŋāĻāĻžā§°āĻāĨ¤)
A. 36 B. 40.5 C. 45 D. 54
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Very Hard Questions: Ratio & Proportion
1. If a : b = 3 : 4 and b : c = 8 : 5, find a : c. (āϝāĻĻāĻŋ a : b = 3 : 4 āĻā§°ā§ b : c = 8 : 5, āϤā§āύā§āϤ⧠a : c āĻŦāĻŋāĻāĻžā§°āĻāĨ¤)
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 āĻā§°ā§ y : z = 9 : 4, āϤā§āύā§āϤ⧠x : z āĻŦāĻŋāĻāĻžā§°āĻāĨ¤)
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. (āĻĻā§āĻāĻž āϏāĻāĻā§āϝāĻžā§° āĻŽāĻžāĻā§° āĻŽāϧā§āϝ āĻ āύā§āĻĒāĻžāϤāĻŋāĻ 12 āĻā§°ā§ āĻāĻāĻž āϏāĻāĻā§āϝāĻž 9 āĻš’āϞ⧠āĻāύāĻā§ āϏāĻāĻā§āϝāĻž āĻŦāĻŋāĻāĻžā§°āĻāĨ¤)
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 āĻā§°ā§ b ā§° āϤā§āϤā§āϝāĻŧ āĻ āύā§āĻĒāĻžāϤāĻŋāĻ 27 āĻā§°ā§ a = 9, āϤā§āύā§āϤ⧠b āĻŦāĻŋāĻāĻžā§°āĻāĨ¤)
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 āĻā§°ā§ x ā§° āĻāϤā§ā§°ā§āĻĨ āĻ āύā§āĻĒāĻžāϤāĻŋāĻ 36 āĻšāϝāĻŧ, āϤā§āύā§āϤ⧠x āĻŦāĻŋāĻāĻžā§°āĻāĨ¤)
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 āĻā§°ā§ b : c = 14 : 15, āϤā§āύā§āϤ⧠a : c āĻŦāĻŋāĻāĻžā§°āĻāĨ¤)
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 āĻā§°ā§ āĻŽā§āĻ 45, āϤā§āύā§āϤ⧠x āĻŦāĻŋāĻāĻžā§°āĻāĨ¤)
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. (āĻĻā§āĻāĻž āϏāĻāĻā§āϝāĻž 4 : 9 āĻ āύā§āĻĒāĻžāϤāϤ āĻāĻā§ āĻā§°ā§ āĻā§āĻŖāĻĢāϞ 576, āϤā§āύā§āϤ⧠āϏāĻāĻā§āϝāĻž āĻĻā§āĻāĻž āĻŦāĻŋāĻāĻžā§°āĻāĨ¤)
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 āĻā§°ā§ b : c = 10 : 3, āϤā§āύā§āϤ⧠a : b : c āĻŦāĻŋāĻāĻžā§°āĻāĨ¤)
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 āĻā§°ā§ b ā§° āĻŽāĻžāĻā§° āĻŽāϧā§āϝ āĻ āύā§āĻĒāĻžāϤāĻŋāĻ 20 āĻā§°ā§ a = 5, āϤā§āύā§āϤ⧠b āĻŦāĻŋāĻāĻžā§°āĻāĨ¤)
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. (āĻĻā§āĻāĻž āϏāĻāĻā§āϝāĻžā§° āĻ āύā§āĻĒāĻžāϤ 7 : 11 āĻā§°ā§ āĻĒāĻžā§°ā§āĻĨāĻā§āϝ 24, āϤā§āύā§āϤ⧠āϏāĻāĻā§āϝāĻž āĻĻā§āĻāĻž āĻŦāĻŋāĻāĻžā§°āĻāĨ¤)
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 āĻā§°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 āĻā§°ā§ y = 24, āϤā§āύā§āϤ⧠x āĻŦāĻŋāĻāĻžā§°āĻāĨ¤)
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 āϤāĻŋāύāĻŋāĻāĻž āϏāĻāĻā§āϝāĻž āϧāĻžā§°āĻžāĻŦāĻžāĻšāĻŋāĻ āĻ āύā§āĻĒāĻžāϤāϤ āĻāĻā§ āĻā§°ā§ āĻĒā§ā§°āĻĨāĻŽāĻā§ 4 āĻā§°ā§ āϤā§āϤā§āϝāĻŧāĻā§ 36, āϤā§āύā§āϤ⧠āĻŽāĻžāĻā§° āϏāĻāĻā§āϝāĻž āĻŦāĻŋāĻāĻžā§°āĻāĨ¤)
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 āĻā§°ā§ b : c = 15 : 7, āϤā§āύā§āϤ⧠a : c āĻŦāĻŋāĻāĻžā§°āĻāĨ¤)
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