6 8

To find the missing number that makes the fractions equal, you need to determine the value of the numerator for the second fraction that would make the fractions equivalent.

Given: $\frac{6}{8} = \frac{3}{x}$

To find $x$, you can cross-multiply:

$6 \times x = 8 \times 3$

$6x = 24$

Now, divide both sides by 6:

$x = \frac{24}{6} = 4$

So, the missing number is 4.

Would you like further explanation or have any other questions?

Here are 5 related questions:

1. How do you solve proportions using cross-multiplication?
2. What is the simplest form of the fraction $\frac{6}{8}$?
3. How can you verify if two fractions are equivalent?
4. What happens when you multiply or divide both the numerator and denominator of a fraction by the same number?
5. How can equivalent fractions be used in solving word problems?

Tip: Always reduce fractions to their simplest form to make comparisons easier!