I need help on proportions (answer)

Giselle, It's not so much about being good at math, it's more about practicing over and over. You can do it! I hope this helps. :) 3/7 = a/21 Write the fraction in vertical form(I can't do it on here)with the 3 over the 7 and the a over the 21. Draw a line from the 3 to the 21 by going through...