To solve the problem of how many students can choose Spanish, we can set up a proportion based on the ratio of Spanish classes to French classes.
Given:
- The ratio of Spanish classes to French classes is 3:1.
- Therefore, for every 4 classes (3 Spanish + 1 French), 3 of those classes are Spanish.
Let:
- \( x \) be the number of classes.
- Total number of classes = \( 3 + 1 = 4 \).
Now, the proportion can be set up like this:
\[ \frac{3 \text{ Spanish classes}}{4 \text{ total classes}} = \frac{x \text{ Spanish students}}{850 \text{ total students}} \]
We can rewrite this proportion as:
\[ \frac{3}{4} = \frac{x}{850} \]
Now, we solve for \( x \):
- Cross multiply:
\[ 3 \times 850 = 4 \times x \]
- Calculate \( 3 \times 850 \):
\[ 2550 = 4x \]
- Divide both sides by 4:
\[ x = \frac{2550}{4} = 637.5 \]
Since we can't have a fraction of a student, we round down to the nearest whole number, so approximately 637 students can choose Spanish.
Thus, the finalized answer is:
Proportion: \( \frac{3}{4} = \frac{x}{850} \) Number of students choosing Spanish: approximately 637 students.