Find the mean proportional between 19 and 78. MCQ with Answer and Explanation

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Find the mean proportional between 19 and 78.

A. 97

B. 76

C. 41

D. 38

Answer: Option D

Solution (By JKSSB Mock Tests)

Mean proportional = √(19 × 78) = √(1482) = 38.

This question belongs to: Maths Ratio and Proportion

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Question #1

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Two numbers are in the ratio 13:11 and their sum is 287. Find the numbers.

A. 138 and 127

B. 158 and 106

C. 286 and 242

D. 143 and 121

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Correct Answer: Option D

Explanation:
Numbers = 13k and 11k. 13k + 11k = 287 ⇒ k = 11. Thus, numbers are 143 and 121.

This question belongs to: Maths Ratio and Proportion

Question #2

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Find the mean proportional between 16 and 39.

A. 55

B. 24

C. 27

D. 48

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Correct Answer: Option B

Explanation:
Mean proportional = √(16 × 39) = √(624) = 24.

This question belongs to: Maths Ratio and Proportion

Question #3

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Milk and water are in ratio 8:2 in a 260 L mixture. Quantity of milk?

A. 255 L

B. 416 L

C. 52 L

D. 208 L

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Correct Answer: Option D

Explanation:
Total parts = 10. Milk = [8 / (8+2)] × 260 = 208 L.

This question belongs to: Maths Ratio and Proportion

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