The residents of a city voted on whether to raise property taxes. The ratio of yes votes to no votes was 4 to 3. If there were 5663 total votes, how many yes votes were there

Set $r$ is a set of rectangles such that (1) only the grid points shown here are used as vertices, (2) all sides are vertical or horizontal and (3) no two rectangles in the set are congruent. if $r$ contains the maximum possible number of rectangles given these conditions, what fraction of the rectangles in set $r$ are squares? express your answer as a common fraction.