'Proportionate' in the Bible

‘Again, if a man consecrates to the Lord part of the fields of his own property, then your valuation shall be proportionate to the seed needed for it: a homer of barley seed at fifty shekels of silver.

If he consecrates his field after the jubilee, however, then the priest shall calculate the price for him proportionate to the years that are left until the year of jubilee; and it shall be deducted from your valuation.