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Question
The 1st, 2nd, and 4th terms of a proportion are 12, 21, and 14 respectively. Its third term is
Options
16
18
21
8
Solution
8
Let the third term be x.
Then, we have:
12 : 21 :: x : 14
We know:
Product of means = Product of extremes
21x = 12 × 14
⇒ 21x = 168
⇒ x = `168/21` = 8
The third term is 8
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