The ratio of almonds to raisins is given as 4:3. This means that for every 4 parts of almonds, there are 3 parts of raisins.
Given that there are 600 almonds in the bag, we can set up a proportion to determine the number of raisins.
Let \( x \) be the number of raisins. The relationship can be expressed as follows:
\[ \frac{600}{x} = \frac{4}{3} \]
To solve for \( x \), we can cross-multiply:
\[ 600 \times 3 = 4 \times x \]
This simplifies to:
\[ 1800 = 4x \]
Now, divide both sides by 4:
\[ x = \frac{1800}{4} = 450 \]
Therefore, there are 450 raisins in the bag of trail mix.