What does "proportionable" mean?

Proportionable: Capable of being proportioned, or made proportional; also, proportional; proportionate. -- Pro*por"tion*a*ble*ness, n. But eloquence may exist without a proportionable degree of wisdom. Burke. Proportionable, which is no longer much favored, was of our [i. e., English writers'] own coining. Fitzed. Hall.