To find the amount of sugar the baker uses, we can set up a proportion using the ratio of sugar to butter. For every 2 1/4 pounds of sugar, there are 3/8 pound of butter.
Let's set up the proportion:
(2 1/4 pounds of sugar) / (3/8 pound of butter) = (x pounds of sugar) / (357 pounds of butter)
Now we can solve for x, which represents the amount of sugar the baker uses.