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Question
Find the third proportional to 8 and 12.
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Solution
Suppose that the third proportional to 8 and 12 is x.
Then, 8 : 12 :: 12 : x
⇒ 8x = 144 (Product of extremes = Product of means)
⇒ x = 18
Hence, the third proportional is 18 .
Then, 8 : 12 :: 12 : x
⇒ 8x = 144 (Product of extremes = Product of means)
⇒ x = 18
Hence, the third proportional is 18 .
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