Two quantities and are said to be directly proportional, proportional, or "in direct proportion" if is given by a constant multiple of , i.e., for a constant. This relationship is commonly written .
See alsoInversely Proportional, Proportional
Explore with Wolfram|Alpha
Cite this as:
Weisstein, Eric W. "Directly Proportional." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/DirectlyProportional.html