'Proportion' in the Bible

In proportion to the extent of the years you shall increase its price, and in proportion to the fewness of the years you shall diminish its price, for it is a number of crops he is selling to you.

If there are still many years, he shall refund part of his purchase price in proportion to them for his own redemption;

and if few years remain until the year of jubilee, he shall so calculate with him. In proportion to his years he is to refund the amount for his redemption.