give one examples of proportion. How do you know they are proportions? Then give three non-examples of proportion. How do you know they are not proportion?

If two ratios are equivalent to each other, then they are said to be in proportion. For example, the ratios 1:2, 2:4, and 3:6 are equivalent ratios.

Step-by-step explanation:

Ratios are proportional if they represent the same relationship. One way to see if two ratios are proportional is to write them as fractions and then reduce them. If the reduced fractions are the same, your ratios are proportional.

225x²+4=0

225x²=0-4

225x²=-4

x²=-4/225

x=±√-4/225