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{{ printedBook.courseTrack.name }} {{ printedBook.name }} In mathematics, a proportion is an equation showing the equivalence of two ratios, or fractions, with different numerators and denominators.
$ba =dc ora:b=c:d $
The first and last numbers in the proportion are called the *extremes*, while the other two numbers are called the *means*.
$ad↓means:↑b =↑c : extremes d↓ $
In a proportion, the product of the $extremes$ is equal to the product of the $means.$

$Ifba =dc ,thenad=bc.$

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In this case, one-third of a pizza is the same amount of pizza as two-sixths or four-twelfths. If the simplified forms of two fractions are equal, then they are said to be proportional.

One-third is proportional to two-sixths and four-twelfths.

The concept of proportionality is also useful in geometric concepts such as the Triangle Proportionality Theorem or when determining if two figures are similar.

These two rectangles are proportional, or *similar*, because the ratio between their corresponding measures is constant. Some geometric figures, such as circles, spheres, squares, and cubes are always proportional to each other in size.