What is x when 39 divided by x equals 31?

To find the answer, just divide the dividend by the quotient: 39 ÷ 31 = 1.258064516129

To prove this, let's compute 39 divided by 1.258064516129: $\frac{39}{1.258064516129} = 31$

How does it work?

Asking what the value of x could be when 39 divided by x gives a result of 31, is equivalent to solving the following equation:

$\frac{39}{x} = 31$

Multiply both sides by x: $\frac{39 x}{x} = 31 x$
$\frac{39 x}{x}$ is equivalent to $\frac{x}{x} \times 39$ , which simplifies to $1 \times 39$ (or just $39$ ).
Thus, the equation becomes: $39 = 31 x$
To find x, divide both sides by 31: $\frac{39}{31} = \frac{31 x}{31}$
Which gives, after simplification: $1.258064516129 = x$ (or $x = 1.258064516129$ )

So, if the dividend is 39 and the quotient is 31, the divisor is 1.258064516129.