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Pro·por·tion·al a.

1. Having a due proportion, or comparative relation; being in suitable proportion or degree; as, the parts of an edifice are proportional.

2. Relating to, or securing, proportion.

3. Math. Constituting a proportion; having the same, or a constant, ratio; as, proportional quantities; momentum is proportional to quantity of matter.

**Proportional logarithms**, logistic logarithms. See under Logistic.

**Proportional scale**, a scale on which are marked parts proportional to the logarithms of the natural numbers; a logarithmic scale.

**Proportional** **scales, compasses, dividers**, etc. Draughting, instruments used in making copies of drawings, or drawings of objects, on an enlarged or reduced scale.