Finding the Third Proportional to 72.75 and 140.81

Step by Step Solution

1. Step 1: Write the proportion equation
   72.75 : 140.81 = 140.81 : x
2. Step 2: Convert to fraction form
   72.75/140.81 = 140.81/x
3. Step 3: Cross multiply
   72.75x = 140.81 × 140.81
4. Step 4: Simplify right side
   72.75x = 19,828.16
5. Step 5: Solve for x
   x = 19,828.16/72.75
6. Step 6: Final answer
   x = 272.55