Write the ratio in lowest terms in order to decide whether the proportion is true or false.

200/240=250/290

To determine if the proportion is true or false, we need to reduce the ratio 200/240 and 250/290 to their lowest terms:

The lowest terms of 200/240 are 5/6.
The lowest terms of 250/290 are 25/29.

Since the two ratios, 5/6 and 25/29, are not equal, the proportion is false.