Ratios & Proportions

A proportion is a statement that two ratios are equivalent to each other. Two ratios form a proportion if their cross products are equal.
Do these ratios form a proportion? and Compare the two cross products. Multiply the numerator of one fraction and the denominator of the other.
The cross products are equal, so the ratios form a proportion. Do these ratios form a proportion? 2 to 5 and 4 to 6 Write the ratios as fractions: and
The cross products are not equal, so the ratios do not form a proportion. 