Solving Percent Problems using Proportions, Lecture notes of Pre-Calculus

Download Solving Percent Problems using Proportions and more Lecture notes Pre-Calculus in PDF only on Docsity! Percent Problems: Proportion Method To solve percent problems using proportions Problems that can be solved using the basic percent equation can also be solved using proportions. The proportion method is based on writing two ratios. One ratio is the percent ratio, written as 100 percent . The second ratio is the amount-to-base ratio, written as base amount . These two ratios form the proportion: base amountpercent = 100 To use the proportion method, first identify the percent, the amount, and the Base (the base usually follows the phrase “percent of”). Example 1: What is 23 % of 45? 45100 23 n = 23(45) = 100n 1035 = 100n 100 100 100 1035 n = 10.35 = n Example 2: What percent of 25 is 4? 25 4 100 = n 25n = 100(4) 25n = 400 %16 25 400 25 25 === nn Math 0300 Student Learning Assistance Center - San Antonio College 1