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?

189 centimeters
193 centimeters
199 centimeters
203 centimeters

Answer 1

it says it is proportional...so lets make a proportion

70/210 = 63 / x....70 inches to 210 cm = 63 inches to x cm
cross multiply
(70)(x) = (210)(63)
70x = 13230
x = 13230/70
x = 189 <==== ur answer

** and if u didn't already know, proportions are nothing but equivalent fractions : 70/210 reduces to 1/3....and 63/189 reduces to 1/3

Answer 2

210/70 = 3 cm per inch

63 x 3 = 189 cm skis needed