Geyer has great ratio and proportions posters to choose from. Use them to decorate your classroom and educate students. Look at our Pi poster that add color and creativity with the eye chart layout. Our poster sets have 4 posters in a set and cover many topics. The topics include Working with Percents, Percent Problems, Percents to Decimals and Percents to Fractions, and more! We also have the golden ratio and symmetry in nature posters to show how math is in everything.