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Question
Find the third proportional to 36, 18
Solution
Let the required third proportional be x
∴ 36, 18, x are in continued proportion
⇒ 36 : 18 = 18 : x
⇒ 36x = 18 × 18
⇒ x = `(18xx18)/36`
⇒ x = 9
∴ Required proportional = 9
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