To find the missing number in the fraction \( \frac{4}{x} = \frac{2}{3} \), we can cross-multiply.
So, we can set up the equation:
\[ 4 \cdot 3 = 2 \cdot x \]
Now, calculate \( 4 \cdot 3 \):
\[ 12 = 2x \]
Next, divide both sides by 2 to solve for \( x \):
\[ x = \frac{12}{2} = 6 \]
Therefore, the missing number is \( 6 \). The completed equation is:
\[ \frac{4}{6} = \frac{2}{3} \]
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