The volume of blood in a person's body is proportional to body weight. A person who weighs 140 pounds has approximately 4 quarts of blood. Estmate the number of quarts of blood in a person who weighs 100 pounds. Determine the proportion. 100 140 Do not simplfty) There are approximately quarts of blood in a person who weighs 100 pounds. Round to two decimal places as needed.)

When two variables are directly proportional, it means that an increase in the value of one variable would cause a corresponding increase in the other variable. Also, a decrease in the value of one variable would cause a corresponding decrease in the other variable.

The volume,V of blood in a person's body is proportional to body weight,W. If we introduce a proportionality constant, k, the expression becomes

W = kV

A person who weighs 140 pounds has approximately 4 quarts of blood. It means that

140 = 4k

k = 140/4 = 35

The equation becomes

W = 35V

Therefore, for a person who weighs 100 pounds, the quarts of blood would be

100 = 35V

V = 100/35

V = 2.86 quarts