What is the third proportional to 16 and 36 ?

81
79
84
88

Correct Answer: 81

Explanation:

f C is the third proportional to A and B, then A/B = B/C If x is the third proportional to 16 and 36, then 16/36 = 36/x => 4/9 = 36/x => x = 36 * 9/4 => x = 9 * 9 => x = 81

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