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Math Help - Proportion problem

  1. #1
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    Proportion problem

    I'm stuck to a proportion problem: A tree which is known to be 75feet high stands on one bank of a river at the waters edge and casts a shadow which just reaches straight across to the other bank, and at the same time a yard stick casts a 4foot shadow. Find the width of the river. Please help, thank you!
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  2. #2
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    Re: Proportion problem

    The tree is as many times taller than the yard stick as the tree's shadow (i.e., the river width) is longer than the yard stick's shadow.
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  3. #3
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    Re: Proportion problem

    Thank you emakarov!
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  4. #4
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    Re: Proportion problem

    I can't figure it out... how do I write it algebraically?
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