Quantitative Aptitude • Ratio, Average & MixtureMedium
What is the mean proportional between 54 and 24?
A. 36✓ Correct Answer
B. 42
C. 39
D. 72
💡 Solution & Explanation
The mean proportional between two numbers a and b is √(a × b). Here √(54 × 24) = √1296 = 36. Check: 54 : 36 = 36 : 24, because 54 × 24 = 36 × 36 = 1296. The average (39) is a different idea.
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