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tatiyna
3 years ago
9

How does a percent relate to a proportion

Mathematics
1 answer:
MaRussiya [10]3 years ago
7 0
Percent means per hundred, which means, when you are using a percent, you are actually using a ratio to compare  the number of your percent to one hundred.
For example, suppose we have 5%. The percent symbol (%) indicates that we are using a ratio to compare 5 to 100, and remember that we use fractions to express ratios, so we can express 5% as the ratio \frac{5}{100}. Notice that we can simplify our ratio, both numerator and denominator are divisible by 5, so lets simplify it: \frac{5}{100} = \frac{1}{20}. We can conclude that we can express 5% as the ratio \frac{1}{20}.

Now that we know we can express a percent as ratio, lets show how the percent is related to a proportion:
Suppose that in a class of 30 students are 12 girls, and you want to find <span>how many percent of girls are in your class using a proportion:
Let </span>x% be the percent girls. Since we know that percents can be expressed as ratios, x%=\frac{x}{100}: Now we can use the fact that the students are in a ratio 12 to 30 to establish our proportion:
\frac{12}{30} = \frac{x}{100}
x= \frac{(12)(100)}{30}
x=40
We just prove that 40% of the students are girls.

The proportion that we used in this problem is called a percent proportion, and its formula: \frac{a}{b} = \frac{x}{100} can be use to relate a percent with a proportion.
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