The author discovered that there was a direct proportion between mathematical memory and understanding.

发现了学生的数学记忆水平与其数学理解水平大致成具有较高相关性的正比关系。

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The national government exerts direct operational control over a large proportion of total health care expenditures, through a range of mechanisms, including caps on hospital revenue and national contracts with salaried physicians.

FORBES: Whiplash-Mitt Romney Lavishes Praise On Israel's Socialist, Government Controlled Healthcare System

But a prosecutor's zeal wanes in direct proportion to the visibility of the target.

FORBES: Magazine Article

Also, a higher proportion of calls to NHS Direct were about flu.

BBC: Flu cases rise over Christmas break