The problem asks us to find the missing number in the proportion $\frac{5}{4} = \frac{?}{20}$. We need to find the value that makes the two fractions equal.

1. Problem Description

The problem asks us to find the missing number in the proportion $\frac{5}{4} = \frac{?}{20}$. We need to find the value that makes the two fractions equal.

2. Solution Steps

To find the missing number, we can set up an equation. Let the missing number be $x$. Then the equation is:

$\frac{5}{4} = \frac{x}{20}$

To solve for $x$, we can cross-multiply:

$5 \times 20 = 4 \times x$

$100 = 4x$

Now, divide both sides of the equation by 4:

$\frac{100}{4} = \frac{4x}{4}$

$25 = x$

Therefore, the missing number is

2

5.

Alternatively, we can observe that the denominator on the right side (20) is 5 times the denominator on the left side (4). So, we multiply the numerator on the left side by 5 to get the numerator on the right side:

$5 \times 5 = 25$.

So, the missing number is

2

5.

3. Final Answer

25