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Math...

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solve the porportion:

9/12=15/?

please help.

  • Math... -

    9 and 15 are the numerators
    12 and ? are the denominators

    Start the problem by setting up an equation by multiplying the numerators with the denominators like this:

    9 x ? = 12 x 15

    Now just solve for ?

  • Math... -

    It is ok to cross multiply but I prefer to multiply both sides by the product of the denominators. It is easier to justify by the rules of equation solving.
    (9/12)(12 x) = (15/x)(12 x)
    9 x = 15*12

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