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Find third proportional 16,36

Your problem `->` third proportional 16,36

If `x` is the third proportional to `a,b` then `a:b :: b:x`.

Let the third proportional to the numbers `16, 36` be `x`.

Then, `16:36=36:x`

`:. 16/36=36/x`

`:. x = (36 xx 36)/(16)`

`:. x = 81`

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