Finding the Third Proportional to 218.50 and 225.50

Step by Step Solution

1. Step 1: Write the proportion equation
   218.50 : 225.50 = 225.50 : x
2. Step 2: Convert to fraction form
   218.50/225.50 = 225.50/x
3. Step 3: Cross multiply
   218.50x = 225.50 × 225.50
4. Step 4: Simplify right side
   218.50x = 50,850.25
5. Step 5: Solve for x
   x = 50,850.25/218.50
6. Step 6: Final answer
   x = 232.72