Find the mean proportional between 31 and 78. MCQ with Answer and Explanation

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Find the mean proportional between 31 and 78.

A. 98

B. 49

C. 109

D. 52

Answer: Option B

Solution (By JKSSB Mock Tests)

Mean proportional = √(31 × 78) = √(2418) = 49.

This question belongs to: Maths Ratio and Proportion

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Practice More Ratio and Proportion Questions

Question #1

If a:b = 7:8 and b:c = 8:7, then a:b:c = ?

A. 6:8:8

B. 7:9:7

C. 14:16:14

D. 7:8:7

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Correct Answer: Option D

Explanation:
Combine ratios: a:b = 7:8, b:c = 8:7 ⇒ a:b:c = 7:8:7.

This question belongs to: Maths Ratio and Proportion

Question #2

If a:b = 3:6 and b:c = 6:7, then a:b:c = ?

A. 2:6:8

B. 6:12:14

C. 3:7:7

D. 3:6:7

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Correct Answer: Option D

Explanation:
Combine ratios: a:b = 3:6, b:c = 6:7 ⇒ a:b:c = 3:6:7.

This question belongs to: Maths Ratio and Proportion

Question #3

If a:b = 7:10 and b:c = 10:12, then a:b:c = ?

A. 7:11:12

B. 7:10:12

C. 14:20:24

D. 6:10:13

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Correct Answer: Option B

Explanation:
Combine ratios: a:b = 7:10, b:c = 10:12 ⇒ a:b:c = 7:10:12.

This question belongs to: Maths Ratio and Proportion

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