Can "pro rata" be used as a verb? And what should the past tense be?

Can pro rata be used as a verb? And what should the past tense be?

The verb form would be prorate or pro rate. The past tense is prorated.

We're calling these pro rata prices and talking about the prices being pro rataed - is this good english? What would be a better way?

Yes, except you would refer to the prices as pro-rated. The second a gets dropped.


If you must, I would prefer pro rated or pro-rated rather than pro rataed, which looks as if it has fallen down a hole between Latin and English and is still showing its scars.