There is another useful way to describe an aspect ratio. If you take the 4:3 aspect ratio and divide 4 by 3, the result is 1.33. Therefore, you could alternately describe the 4:3 aspect ratio as 1.33:1, meaning that for every 1.33 units in width, there is 1 unit in height. Again, the same applies for the 16:9. When you divide 16 by 9, the result is 1.78. In the case of the 16:9 aspect ratio, you can alternately describe its aspect ratio as 1.78:1, meaning that for every 1.78 units in width, there is 1 unit in height.