Finding the Third Proportional to 72.75 and 140.75

Step by Step Solution

1. Step 1: Write the proportion equation
   72.75 : 140.75 = 140.75 : x
2. Step 2: Convert to fraction form
   72.75/140.75 = 140.75/x
3. Step 3: Cross multiply
   72.75x = 140.75 × 140.75
4. Step 4: Simplify right side
   72.75x = 19,810.56
5. Step 5: Solve for x
   x = 19,810.56/72.75
6. Step 6: Final answer
   x = 272.31