proportional
按比例的, 成比例的：
as the pound has fallen costs have risen on a pro rata basis.
随着英镑的下跌, 成本相应增加了。
proportionally
按比例, 成比例：
their fees will rise pro rata with salaries.
他们的收费将和薪水成比例提高。
词源
late 16th cent.: Latin，literally 'according to the rate'.