Question

Michiko works in a shop that rents cross-country skis. Two clients come in to rent skis. Michiko knows that a person's height is proportional to his or her correct ski length. She figures out that the first client, who is 70 inches tall, needs 210-centimeter skis. The second client is 63 inches tall. What length of skis does the second client need?

Answer 1

Direct proportionality implies that there's a constant ratio between the two values. Find it out from the first client's numbers, then use it to figure out the second cilent's needs.