Finding the Third Proportional to 11.75 and 15.50

Step by Step Solution

1. Step 1: Write the proportion equation
   11.75 : 15.50 = 15.50 : x
2. Step 2: Convert to fraction form
   11.75/15.50 = 15.50/x
3. Step 3: Cross multiply
   11.75x = 15.50 × 15.50
4. Step 4: Simplify right side
   11.75x = 240.25
5. Step 5: Solve for x
   x = 240.25/11.75
6. Step 6: Final answer
   x = 20.45