# CONVERSION

, or Convertendo, is when there
are four proportionals, and it is inferred, that the first
is to its excess above the 2d, as the third to its excess
above the 4th: according to Euclid, lib. 5, def. 17.

Thus, if it be | 8 : 6 :: 4 : 3, |

then convertendo, or by conversion, | 8 : 2 :: 4 : 1, |

Or if there be | *a : b :: c : d,* |

then convertendo, or by conversion, | *a : a*-*b :: c : c*-*d.* |

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Entry taken from A Mathematical and Philosophical Dictionary, by Charles Hutton, 1796.

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