Find the third proportional to 5, 10 - Mathematics

Find the third proportional to 5, 10

Sum

Let x be the third proportional to 5, 10,
then 5 : 10 :: 10 : x
∴ 5 × x = 10 x 10
⇒ x = `(10 xx 10)/(5)`
= 20
∴ Third proportional = 20.

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