This document is a lesson on proportions that includes examples of setting up and solving proportions. It begins with a definition of a proportion as an equality of two ratios. It then works through examples of solving single-variable proportions by cross multiplying. Later examples ask students to determine if two ratios form a proportion and solve a word problem involving converting between nautical and statute miles using a proportion. The homework assignment is to complete problems 5 through 20 on page 292.