Finding the Third Proportional to 72.75 and 166.31

Step by Step Solution

1. Step 1: Write the proportion equation
   72.75 : 166.31 = 166.31 : x
2. Step 2: Convert to fraction form
   72.75/166.31 = 166.31/x
3. Step 3: Cross multiply
   72.75x = 166.31 × 166.31
4. Step 4: Simplify right side
   72.75x = 27,659.85
5. Step 5: Solve for x
   x = 27,659.85/72.75
6. Step 6: Final answer
   x = 380.20