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How did they come up with 24 to the following ?

Calculate the 4th proportional to 5,8,15 ?

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    4 can't be the solution.2012-07-03
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    Sorry that was a misprint - I meant 242012-07-03
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    $\frac{5}{8}=\frac{15}{x}$ which gives you $24$2012-07-03
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    Agree with @SaurabhHota.2012-07-03
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    @SaurabhHota Thanks ..That was simple2012-07-03

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