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The Collaborative International Dictionary
Proportionableness

Proportionable \Pro*por"tion*a*ble\, a. 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.

Wiktionary
proportionableness

n. Quality of being proportionable.