Direct Proportionality
Given two variables x and y, y is directly proportional to x (x and y vary directly, or x and y are in direct variation) if there is a non-zero constant k such that
The relation is often denoted, using the ∝ symbol, as
and the constant ratio
is called the proportionality constant or constant of proportionality.
Read more about this topic: Proportionality (mathematics)
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“A temple, you know, was anciently “an open place without a roof,” whose walls served merely to shut out the world and direct the mind toward heaven; but a modern meeting-house shuts out the heavens, while it crowds the world into still closer quarters.”
—Henry David Thoreau (1817–1862)