What is x when 54 divided by x equals 78?

To find the answer, just divide the dividend by the quotient: 54 ÷ 78 = 0.69230769230769

To prove this, let's compute 54 divided by 0.69230769230769: $\frac{54}{0.69230769230769} = 78$

How does it work?

Asking what the value of x could be when 54 divided by x gives a result of 78, is equivalent to solving the following equation:

$\frac{54}{x} = 78$

Multiply both sides by x: $\frac{54 x}{x} = 78 x$
$\frac{54 x}{x}$ is equivalent to $\frac{x}{x} \times 54$ , which simplifies to $1 \times 54$ (or just $54$ ).
Thus, the equation becomes: $54 = 78 x$
To find x, divide both sides by 78: $\frac{54}{78} = \frac{78 x}{78}$
Which gives, after simplification: $0.69230769230769 = x$ (or $x = 0.69230769230769$ )

So, if the dividend is 54 and the quotient is 78, the divisor is 0.69230769230769.