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Two numbers or variables are directly proportional if their ratio is constant.

Put another way, two numbers or variables are directly proportional if one of them is a constant multiple of the other.

a is proportional to b ( a ∝ b ) if

a/b= constant or equivalently a=b x (constant)

When to numbers or variables are directly proportional, if one doubles the other doubles,

if one is halved the other is halved, etc.

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Q: What is Proportional relationship of two numbers or things being measured?

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