The following data was collected on a cheetah. it ran ½ mile in 2/3 min, ¼ mile in 1/3 min, and ¾ mile in one minute. 1. explain how you know that this is a proportional relationship. 2. identify the constant of proportionality, and write an equation for the proportional relationship. 3. make a table and a graph of proportional relationship. 4. identify a point on the graph that gives the constant of proportionality as the y-coordinate.