A true proportion is when two ratios are equal to one another. To prove this, you need to find the cross products of the ratios and see if they are equal. An example of a true proportion are the ratios 1/2 and 5/10, if you take the cross product the result is 2 x 5 = 1 x 10, which are equal.
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the three kinds of proportions are indirect proportion, direct proportion and thepartitive proportion
There cannot be a "proportion of something": proportion is a relationship between two things, and how you solve it depends on whether they (or their transformations) are in direct proportion or inverse proportion.
A large proportion of my daily activities are spent in school.
An equation that states that two ratios are equal is a proportion.