Let the unknown number be represented by \( x \). According to the problem, the sum of 4.5 and one-third of the number is at most 38.9. This can be expressed with the following inequality:
\[ 4.5 + \frac{1}{3}x \leq 38.9 \]
To solve this inequality for \( x \), follow these steps:
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Subtract 4.5 from both sides:
\[ \frac{1}{3}x \leq 38.9 - 4.5 \] \[ \frac{1}{3}x \leq 34.4 \]
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Multiply both sides by 3 to isolate \( x \):
\[ x \leq 34.4 \times 3 \] \[ x \leq 103.2 \]
Thus, the solution set for \( x \) is:
\[ x \leq 103.2 \]
Therefore, all possible values of the number \( x \) are those that satisfy the inequality \( x \leq 103.2 \).