Finding the Third Proportional to 111.25 and 211.25

Step by Step Solution

1. Step 1: Write the proportion equation
   111.25 : 211.25 = 211.25 : x
2. Step 2: Convert to fraction form
   111.25/211.25 = 211.25/x
3. Step 3: Cross multiply
   111.25x = 211.25 × 211.25
4. Step 4: Simplify right side
   111.25x = 44,626.56
5. Step 5: Solve for x
   x = 44,626.56/111.25
6. Step 6: Final answer
   x = 401.14