Given a positive real number $t$ , determine the sets $A$ of real numbers containing $t$ , for which there exists a set $B$ of real numbers depending on $A$ , $|B| \geq 4$ , such that the elements of the set $AB =\{ ab \mid a\in A , b \in B \}$ form a finite arithmetic progression .
1. **Define the sets and the arithmetic progression condition:**
   - Let \( A \) be a set of real numbers containing \( t \).
   - Let \( B \) be a set of real numbers such that \( |B| \geq 4 \).
   - The set \( AB = \{ ab \mid a \in A, b \in B \} \) forms a finite arithmetic progression.

2. **Consider the simplest case where \( A = \{ t \} \):**
   - If \( A = \{ t \} \), then \( AB = \{ tb \mid b \in B \} \).
   - For \( AB \) to form an arithmetic progression, the elements \( tb \) must be equally spaced.
   - This implies that the elements of \( B \) must be equally spaced, i.e., \( B \) must be an arithmetic progression itself.

3. **Consider the case where \( A = \{ t, -t \} \):**
   - If \( A = \{ t, -t \} \), then \( AB = \{ tb, -tb \mid b \in B \} \).
   - For \( AB \) to form an arithmetic progression, the elements \( tb \) and \( -tb \) must be equally spaced.
   - This implies that \( B \) must be symmetric around zero and form an arithmetic progression.

4. **Verify the conditions for \( A = \{ t \} \) and \( A = \{ t, -t \} \):**
   - For \( A = \{ t \} \), \( B \) can be any set of 4 or more equally spaced real numbers.
   - For \( A = \{ t, -t \} \), \( B \) must be symmetric around zero and form an arithmetic progression.

5. **Conclusion:**
   - The possible sets \( A \) are \( \{ t \} \) and \( \{ t, -t \} \).

The final answer is \( \boxed{ \{ t \} } \) and \( \{ t, -t \} \).