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Book VI   Proposition 22
For let there be taken
    a third proportional O to AB, CD
and
    a third proportional P to EF, GH. [VI.11]

Then, since,
    as AB is to CD, so is EF to GH,
and
    as CD is to O, so is GH to P.
therefore, ex aequali,
    as AB is to O, so is EF to P. [V.22]
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