# Ratio

The ratio of *a* to *b* is a way to convey the idea of relative magnitude of two amounts. Thus if the number *a* is always twice the number *b*, we can say that the ratio of *a* to *b* is "2 to 1." This ratio is sometimes written 2:1. Today, however, it is more common to write a ratio as a fraction, in this case 2/1.

At one time, ratios were in common use in solving problems and the terms "antecedent " for the numerator *a* and "consequent " for the denominator *b* were used. Today most problems concerning ratios are solved by treating ratios as fractions.

## Additional topics

Science EncyclopediaScience & Philosophy: *Quantum electronics* to *Reasoning*