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Find fourth proportional 3,7,15

Your problem `->` fourth proportional 3,7,15

In `a:b :: c:d`, we say that `d` is the fourth proportional to `a,b,c`.

Let the fourth proportional to the numbers `3, 7, 15` be `x`.

Then, `3:7=15:x`

`:. 3/7=15/x`

`:. x = (7 xx 15)/(3)`

`:. x = 35`

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