The document compares the sizes of a tennis court and ping pong table. It notes that a tennis court is 78 feet long and 36 feet wide, while a ping pong table is 9 feet long and 5 feet wide. It then calculates the length and width ratios and determines that the tennis court and ping pong table are not proportional since the length ratio is 3:26 and the width ratio is 5:36.