Quantitative Aptitude • Ratio, Average & MixtureMedium
What is the mean proportional between 8 and 72?
A. 24✓ Correct Answer
B. 40
C. 26
D. 48
💡 Solution & Explanation
The mean proportional between two numbers a and b is √(a × b). Here √(8 × 72) = √576 = 24. Check: 8 : 24 = 24 : 72, because 8 × 72 = 24 × 24 = 576. The average (40) is a different idea.
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