To find out how far Sally walked on the Tremont Trail, we need to calculate $\frac{3}{4}$ of the total trail length, which is $3 \frac{1}{2}$ miles.

Step 1: Convert the mixed number to an improper fraction

First, convert $3 \frac{1}{2}$ miles to an improper fraction:

$3 \frac{1}{2} = \frac{7}{2}$

Step 2: Multiply by $\frac{3}{4}$

Now, multiply $\frac{7}{2}$ by $\frac{3}{4}$:

$\frac{7}{2} \times \frac{3}{4} = \frac{7 \times 3}{2 \times 4} = \frac{21}{8}$

Step 3: Convert the result to a mixed number

Convert $\frac{21}{8}$ back to a mixed number:

$\frac{21}{8} = 2 \frac{5}{8}$

So, Sally walked $2 \frac{5}{8}$ miles on the Tremont Trail.

Final Answer:

Sally walked $2 \frac{5}{8}$ miles before stopping.

Would you like further details on the steps or any clarifications?

Here are 5 related questions to explore:

1. How much farther does Sally need to walk to complete the trail?
2. What fraction of the trail has Sally yet to walk?
3. If the total trail length were doubled, how far would Sally have walked?
4. How would the result change if Sally walked $\frac{5}{6}$ of the trail instead of $\frac{3}{4}$?
5. If Sally walked the trail at a pace of 2 miles per hour, how long did she walk before stopping?

Tip: Converting mixed numbers to improper fractions makes multiplication easier when dealing with fractions!