What is x when 87 divided by x equals 19?

To find the answer, just divide the dividend by the quotient: 87 ÷ 19 = 4.5789473684211

To prove this, let's compute 87 divided by 4.5789473684211: $\frac{87}{4.5789473684211} = 19$

How does it work?

Asking what the value of x could be when 87 divided by x gives a result of 19, is equivalent to solving the following equation:

$\frac{87}{x} = 19$

Multiply both sides by x: $\frac{87 x}{x} = 19 x$
$\frac{87 x}{x}$ is equivalent to $\frac{x}{x} \times 87$ , which simplifies to $1 \times 87$ (or just $87$ ).
Thus, the equation becomes: $87 = 19 x$
To find x, divide both sides by 19: $\frac{87}{19} = \frac{19 x}{19}$
Which gives, after simplification: $4.5789473684211 = x$ (or $x = 4.5789473684211$ )

So, if the dividend is 87 and the quotient is 19, the divisor is 4.5789473684211.