To fill in the blank, we need to determine what value \(x\) would satisfy the equation:
\[ 3x \cdot \frac{3}{4} = 3 \cdot \frac{3}{4} \cdot x. \]
Let's say you want to express \(3/4\) of some quantity \(y\). The equation would look like:
\[ \frac{3}{4} \cdot y = 3 \cdot \frac{3}{4}. \]
We can rearrange this to find the value of \(y\):
\[ y = \frac{3 \cdot 4}{3} = 4. \]
So, \(3/4\) of \(4\) is equal to \(3\).
If you meant for the statement to equal \(3x/4\), it would depend on what you are actually equalizing it to. Please clarify if you need a specific equation to solve!