different between proportionately vs proportionably

English

proportionate +? -ly

proportionately (comparative more proportionately, superlative most proportionately)

proportionately in The Century Dictionary, New York, N.Y.: The Century Co., 1911.
proportionately in Webster’s Revised Unabridged Dictionary, G. & C. Merriam, 1913.

From proportionable +? -ly.

proportionably (comparative more proportionably, superlative most proportionably)

In a proportionable manner; proportionately.
- 1798, Thomas Malthus, An Essay on the Principle of Population, p.79:
  It may at first appear strange, but I believe it is true, that I cannot by means of money raise a poor man and enable him to live much better than he did before, without proportionably depressing others in the same class.

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