Compare the simplified ratios, which are 1 : 3.
13 to 15 39 to 45
They are: 13 to 15 and 39 to 45
30 to 12 45 to 18
10:30, 20:60, 15:45 are three possible ratios
They are called equivalent ratios.
Two ratios that are equivalent are said to be in proportion
Two ratios are the equivalent when their simplified forms are identical.
when a number of ratios give the same answer after solving the ratios the ratios are said to be equivalent ratios