e.g. You will be awarded a score that is proportional to your performance, with a strong performance earning a high score.
e.g. The amount of money you spend on supplies is proportional to the amount of supplies you buy, because if you buy more supplies, you will spend more money.
e.g. The distance you travel is a proportional of the time for which you travel, since you are likely to go further if you drive for longer.
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