Solution:
1. Given:
- The total recipe yields 4 portions.
2. Define the size of the standard portion:
- If we assume the entire recipe represents one complete unit of the recipe, then dividing this unit by the number of portions gives us the size of one portion.
3. Calculate the size of one portion:
- Let \S \ be the total size of the recipe.
- Size of one portion = \\frac{S}{4} \
4. Final result:
- The size of the standard portion is \\frac{S}{4} \, where \S \ is the total size of the recipe.