Finding the Third Proportional to 43.75 and 86.31

Step by Step Solution

1. Step 1: Write the proportion equation
   43.75 : 86.31 = 86.31 : x
2. Step 2: Convert to fraction form
   43.75/86.31 = 86.31/x
3. Step 3: Cross multiply
   43.75x = 86.31 × 86.31
4. Step 4: Simplify right side
   43.75x = 7,449.85
5. Step 5: Solve for x
   x = 7,449.85/43.75
6. Step 6: Final answer
   x = 170.28