What is 3/7 of 39?

How to calculate 3/7 of 39?

1. Multiply the whole number by the numerator of the fraction: 39 × 3 = 117
2. Divide this result by denominator of the fraction: 117/7 = 16.714285714286

Since 117/7 is an improper fraction, the result could also be expressed as a mixed number: 16 5/7

How does it work?

The principle behind finding a fraction of a number, such as 3/7 of 39, is rooted in the method of cross-multiplication.

Consider the following proportion: $\frac{3}{7}=\frac{x}{39}$ (where x represents 3/7 of 39)

1. Using the cross-multiplication method, multiply both numerators by their opposite denominators: $3\times 39=7x$
2. Which gives: $117=7x$
3. Divide both sides by 7 to isolate x: $\frac{117}{7}=\frac{7x}{7}$
4. Which gives the result: $\frac{117}{7}=x$

Thus, 3/7 of 39 is equal to 117/7 (or 16.714285714286 in its decimal form).