alleryThe mean proportional between 4 and 16 equals
Aexactly ten
Bexactly twelve
Cexactly eight
Dexactly four
Answer & Solution
Correct answer: C. exactly eight
1. Mean proportional between a and c is sqrt(a * c).
2. Substitute a = 4 and c = 16: sqrt(4 * 16).
3. = sqrt(64).
4. = 8, written as 'exactly eight'.
_Source: ICAI BoS Foundation Paper 3, Ch 1 Unit II 'Proportions', p.7_
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