To make the statement \( \frac{4}{3} \cdot __ < \frac{4}{3} \) true, we need to find a number that, when multiplied by \( \frac{4}{3} \), results in a product that is less than \( \frac{4}{3} \).
Testing the given options:
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If we choose \( \frac{1}{5} \): \[ \frac{4}{3} \cdot \frac{1}{5} = \frac{4}{15} \] This is less than \( \frac{4}{3} \), so this works.
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If we choose \( \frac{4}{3} \): \[ \frac{4}{3} \cdot \frac{4}{3} = \frac{16}{9} \] This is greater than \( \frac{4}{3} \), so this does not work.
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If we choose \( 1 \): \[ \frac{4}{3} \cdot 1 = \frac{4}{3} \] This is not less than \( \frac{4}{3} \), so this does not work.
Thus, the only option that makes the statement true is:
\(\frac{1}{5}\).
So, the correct answer is \( \frac{1}{5} \).