'Proportion' in the Bible

You are to increase its price in proportion to a greater amount of years, and decrease its price in proportion to a lesser amount of years, because what he is selling to you is a number of harvests.

If many years are still left, he must pay his redemption price in proportion to them based on his purchase price.

If only a few years remain until the Year of Jubilee, he will calculate and pay the price of his redemption in proportion to his remaining years.

But if he consecrates his field after the Jubilee, the priest will calculate the price for him in proportion to the years left until the next Year of Jubilee, so that your assessment will be reduced.