Finding the Third Proportional to 111.50 and 220.25

Step by Step Solution

1. Step 1: Write the proportion equation
   111.50 : 220.25 = 220.25 : x
2. Step 2: Convert to fraction form
   111.50/220.25 = 220.25/x
3. Step 3: Cross multiply
   111.50x = 220.25 × 220.25
4. Step 4: Simplify right side
   111.50x = 48,510.06
5. Step 5: Solve for x
   x = 48,510.06/111.50
6. Step 6: Final answer
   x = 435.07