Quantitative Aptitude • Ratio, Average & MixtureMedium
What is the mean proportional between 16 and 9?
A. 12.5
B. 12✓ Correct Answer
C. 24
D. 5
💡 Solution & Explanation
The mean proportional between two numbers a and b is √(a × b). Here √(16 × 9) = √144 = 12. Check: 16 : 12 = 12 : 9, because 16 × 9 = 12 × 12 = 144. The average (12.5) is a different idea.
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