Find the mean proportional between 10 and 48. MCQ with Answer and Explanation

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Find the mean proportional between 10 and 48.

A. 24

B. 58

C. 42

D. 21

Answer: Option D

Solution (By JKSSB Mock Tests)

Mean proportional = √(10 × 48) = √(480) = 21.

This question belongs to: Maths Ratio and Proportion

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Practice More Ratio and Proportion Questions

Question #1

If a:b = 7:10 and b:c = 10:9, then a:b:c = ?

A. 7:10:9

B. 14:20:18

C. 6:10:10

D. 7:11:9

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Correct Answer: Option A

Explanation:
Combine ratios: a:b = 7:10, b:c = 10:9 ⇒ a:b:c = 7:10:9.

This question belongs to: Maths Ratio and Proportion

Question #2

Two numbers are in ratio 6:12. Their difference is 108. What is their sum?

A. 207

B. 554

C. 447

D. 414

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Correct Answer: Option D

Explanation:
Numbers 6k, 12k. Difference |6-12|k = 108 ⇒ k = 18. Sum = (6+12)k ≈ 414.

This question belongs to: Maths Ratio and Proportion

Question #3

Ratio of present ages of A and B is 7:8. After 10 years, the ratio becomes 9:10. Present age of A is?

A. 147 years

B. 143 years

C. 152 years

D. 294 years

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Correct Answer: Option A

Explanation:
Let ages 7k and 8k. Then (7k + 10)/(8k + 10) = 9/10. Solving gives k ≈ 21, age of A = 7*21 = 147.

This question belongs to: Maths Ratio and Proportion

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