What is x when 90 divided by x equals 19?

To find the answer, just divide the dividend by the quotient: 90 ÷ 19 = 4.7368421052632

To prove this, let's compute 90 divided by 4.7368421052632: $\frac{90}{4.7368421052632} = 19$

How does it work?

Asking what the value of x could be when 90 divided by x gives a result of 19, is equivalent to solving the following equation:

$\frac{90}{x} = 19$

Multiply both sides by x: $\frac{90 x}{x} = 19 x$
$\frac{90 x}{x}$ is equivalent to $\frac{x}{x} \times 90$ , which simplifies to $1 \times 90$ (or just $90$ ).
Thus, the equation becomes: $90 = 19 x$
To find x, divide both sides by 19: $\frac{90}{19} = \frac{19 x}{19}$
Which gives, after simplification: $4.7368421052632 = x$ (or $x = 4.7368421052632$ )

So, if the dividend is 90 and the quotient is 19, the divisor is 4.7368421052632.