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What is Proportionality constant ?
Proportionality constant:
Two varying quantities are said to be in a relation of proportionality when either their ratio or their product yields a constant.
The value of this constant is called the coefficient of proportionality or proportionality constant.
If the ratio $\frac{y}{x}$ of two variables ($x$ and $y$) is equal to a constant ($k =\frac{y}{x}$), then the variable in the numerator of the ratio ($y$) can be the product of the other variable and the constant ($y = k ⋅ x$).
In this case, $y$ is said to be directly proportional to $x$ with proportionality constant $k$.
If the product of two variables ($x ⋅ y$) is equal to a constant ($k = x ⋅ y$), then the two are said to be inversely proportional to each other with the proportionality constant $k$.
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