The cross product property of proportions. Example Divide both sides by a common factor Example Simplify. . trigonometric ratios sohcahtoa worksheet For more information on each lesson click on the individual lessons. L1-2 Ratio and proportion is great introduction to ratio and proportion problems with lots of examples followed by a quiz (ideal for interactive whiteboard use) for up to 3 players. In a proportion, if the ratios are equivalent.