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Question
In proportion, the 1st, 2nd, and 4th terms are 51, 68, and 108 respectively. Find the 3rd term.
Solution
Let the 3rd term be x.
Thus, 51 : 68 :: x : 108
We know:
Product of extremes = Product of means
51 × 108 = 68 × x
⇒ 5508 = 68x
⇒ x = `5508/68` = 81
Hence, the third term is 81.
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