What is 4/1 of 87?

Often, in mathematics or everyday life, we need to find a fraction of a given number. For instance, how would you quickly calculate 4/1 of 87? We'll show you a straightforward method to achieve that.

How to calculate 4/1 of 87?

  1. Multiply the whole number by the numerator of the fraction: 87 × 4 = 348
  2. Divide this result by denominator of the fraction: 348/1 = 348

How does it work?

The principle behind finding a fraction of a number, such as 4/1 of 87, is rooted in the method of cross-multiplication.

Consider the following proportion: 4 1 = x 87 (where x represents 4/1 of 87)

  1. Using the cross-multiplication method, multiply both numerators by their opposite denominators: 4 × 87 = 1 x
  2. Which gives: 348 = 1 x
  3. Divide both sides by 1 to isolate x: 348 1 = 1 x 1
  4. Which gives the result: 348 1 = x

Thus, 4/1 of 87 is equal to 348/1 (or 348 in its decimal form).