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What is the difference between saying that one quantity is proportional to another and saying it is equal to another?

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Proportional - a change in one quantity implies a corresponding change in the other; when one quantity is equal to
another, they are identical
User Kevin Horn
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In mathematics, two variables are proportional if a change in one is always accompanied by a change in the other, and if the changes are always related by use of a constant multiplier. Hope this answers the question. Have a nice day. Feel free to ask more questions.
User Usman Riaz
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