Finding the Third Proportional to 111.25 and 156.25

Step by Step Solution

1. Step 1: Write the proportion equation
   111.25 : 156.25 = 156.25 : x
2. Step 2: Convert to fraction form
   111.25/156.25 = 156.25/x
3. Step 3: Cross multiply
   111.25x = 156.25 × 156.25
4. Step 4: Simplify right side
   111.25x = 24,414.06
5. Step 5: Solve for x
   x = 24,414.06/111.25
6. Step 6: Final answer
   x = 219.45