Translating "比例" into English: Understanding and Usage
This chart shows the proportion of males to females.
According to the survey, the proportion between the cost of the product and the selling price is 1:3.
When "比例" specifically refers to a fraction of 100, indicating the parts per hundred of the whole, "percentage" is the appropriate term:
This year's inflation rate has reached five percent.
When "比例" pertains to the size or extent of something in relation to something else, "scale" might be a more appropriate translation:
Research shows that seventy percent of students are concerned about this issue.
The scale of this city is continuously expanding.
The scale of this map is 1:10000.