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Math Help - Missing step converting ratio to whole number

  1. #1
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    Missing step converting ratio to whole number

    Guys,

    Just looking through a chapter on Ratio's and one of the examples is:

    ----------

    Q: Divide a mass of 380 kg in the ratio 3/4 : 1/5

    S: It is simpler to work with whole numbers, so first of all we produce and equivalent ratio by multiplying each term, first by 4, and then by 5 to give

    3/4 : 1/5 = 3 : 4/5 = 15:4

    -----------


    I understand how to get from 3/4 : 1/5 to 15 : 4 by the lcm but I'm not sure where the 3 : 4/5 comes from, thats the step I'm missing.

    Thanks
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  2. #2
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    Anyone?
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  3. #3
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    Is this in the wrong topic for this question?

    Too hard? Too easy?
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  4. #4
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    Quote Originally Posted by c19h28o2 View Post
    3/4 : 1/5 = 3 : 4/5 = 15:4
    Both parts of the ratio have been multiplied by 4

    4.\frac{3}{4}=3 and 4.\frac{1}{5}=\frac{4}{5}
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