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The third proportional to 16 and 36 is:
A64
B81
C49
D72
Answer & Solution
Correct answer: B. 81
1. Per OCR example: "Third Proportional to 16 & 36 is 16:36::36:x, so 16x = 36×36, x = 81."
2. Setup: a:b :: b:c, solve for c.
3. x = 36² / 16 = 1296/16 = 81.
_Source: ICMAI BoS CMA Foundation Paper 3 (FBMS) — Paper3_07042026.pdf, Module 1 §1.1 (page 12)_