Ratios and Proportions

If you know two figures are * similar*, how can you find the missing lengths for the second figure?. Sample problem here.

How to use ratios (and ratio tables) to solve a proportion. Sample problem here.

Learn how to solve proportion word problems. Sample problem here.

There are many ways to solve a proportion. This page shows you * three* methods. $$\frac{6}{9}\,=\,\frac{x}{12}$$

Learn how to turn any ratio into a *unit ratio*. $$\frac{5}{4}\,=\,\frac{[ ]}{ 1 }$$

How can you tell if two ratios are equivalent to each other? This page shows you. Sample problem here.

Writing ratios in simplest form. $$\frac{12}{15}\,\rightarrow~\,\frac{4}{5}$$