Ratios and Proportions

Each of the problems below is a link. If you click on the problem, it will take you to a YouTube video of a full, step-by-step solution for the problem. You may try these problems as practice and use the videos to check your answer, or you can just watch the videos to see more worked-out example problems.

Express each ratio in lowest terms: 18 to 81, 28 to 20, 64 to 144, and 60 to 12
Express each ratio in lowest terms: 1 pint to 4 quarts, 12 feet to 6 yards, and 3 dollars to 75 cents
Solve each proportion: 18 over x = 9 fifths, x over 12 = 3 fourths, the fraction with numerator x - 2 and denominator 9 equals 2 thirds, and 4 fifths equals the fraction with numerator 20 and denominator x + 10