To find the total amount needed for the trip, we can set up the equation based on the information given. If $115 is one-sixth of the total amount needed, we can denote the total amount needed as \( x \).
The relationship can be expressed as:
\[ \frac{1}{6} x = 115 \]
To solve for \( x \), we multiply both sides of the equation by 6:
\[ x = 115 \times 6 \]
Calculating the right side:
\[ x = 690 \]
Thus, the total amount needed for the trip is $690.