To make the two fractions equivalent, we need to find the number that goes in the blank. 

Given:
\[
\frac{4}{5} = \frac{x}{20}
\]

We can solve for \(x\) by cross-multiplying:
\[
4 \times 20 = 5 \times x
\]
\[
80 = 5x
\]

Now, divide both sides by 5:
\[
x = \frac{80}{5} = 16
\]

So, \(\frac{4}{5} = \frac{16}{20}\).

Would you like further details on this? Here are 5 related questions:

1. How do you find equivalent fractions?
2. Can you simplify \(\frac{16}{20}\)?
3. What are the steps of cross-multiplication?
4. How do you find the least common denominator between two fractions?
5. How do you solve for an unknown in a proportion?

**Tip**: Always simplify fractions if possible to make calculations easier.

Learn how to solve the fraction problem 4/5 = x/20 by using cross-multiplication. This problem involves key mathematical concepts like equivalent fractions and proportions, suitable for Grades 5-6.

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