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Theory of Proportions - what is it?

  1. Dec 22, 2011 #1
    I've recently got back into studying maths in my own time and I've come across this (see attached image)
    The middle line.. I put some numbers in there and those equalities do not hold..
    I don't see why we can set everything there equal..
    Could someone explain this to me or at least point me in the right direction?
    I've tried googling theory of proportions but all I've managed to get was chemistry related stuff

    I was having a good night of study until that came up as well :(

    Thanks in advance
     

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  2. jcsd
  3. Dec 24, 2011 #2
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