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 .

# Directly Proportional

## See also

Inversely 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