The Circumference of a circle is directly proportional to the diameter.
The constant of proportion is 'pi = 3.141592....'.
Another one is force is directly proportional to mass.
The constyant of proportion is acceleration.
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the three kinds of proportions are indirect proportion, direct proportion and thepartitive proportion
No, it is not.
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.
Are in direct proportion
y = kx where k is a non-zero constant is an equation of direct proportionality between x and y.