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. 76

B. 97

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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Milk and water are in ratio 9:2 in a 345 L mixture. Quantity of milk?

A. 282 L

B. 564 L

C. 63 L

D. 303 L

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Correct Answer: Option A

Explanation:
Total parts = 11. Milk = [9 / (9+2)] × 345 = 282 L.

This question belongs to: Maths Ratio and Proportion

Question #2

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Milk and water are in ratio 7:7 in a 233 L mixture. Quantity of milk?

A. 116 L

B. 117 L

C. 232 L

D. 138 L

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Correct Answer: Option A

Explanation:
Total parts = 14. Milk = [7 / (7+7)] × 233 = 116 L.

This question belongs to: Maths Ratio and Proportion

Question #3

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Find the mean proportional between 11 and 61.

A. 72

B. 28

C. 50

D. 25

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Correct Answer: Option D

Explanation:
Mean proportional = √(11 × 61) = √(671) = 25.

This question belongs to: Maths Ratio and Proportion

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