名词
中文翻译：比例除数
同义词：
['proportional factor', 'proportionality factor例句：1. The proportion of students who failed the exam was 20%.（考试不及格的学生占学生总数的20%。）']
例句：
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1. The proportion of students who failed the exam was 20%.
考试不及格的学生占学生总数的20%。
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2.The company's profitability is directly proportional to its sales volume.
公司的盈利能力与其销售额成正比。
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3. The ratio of male to female students in this class is 4:6.
这个班级中男生和女生的比例是4:6。