How do you calculate 4to 1 ratio?

To calculate a 4 to 1 ratio, you can express it as a fraction, which is 4:1 or 4/1. This means for every 4 parts of one quantity, there is 1 part of another quantity. If you have a total amount, you can divide it by the sum of the ratio parts (in this case, 4 + 1 = 5) to find the value of each part. Then, multiply the value of each part by 4 for the first quantity and by 1 for the second quantity.