I wanted to figure out how many grams were to a lb and instead of looking it up I used my textbook and found 1 kg = 1000 g and 1 kg = 2.205 lb. I set up a cross multiplication equation to solve for x. The number I got was close but off by a few hundredths. I got 453.5147 g = 1 lb. I looked to see if I was right and found that the actual number is 453.59 g to lb. What did I do wrong?