Finding the Third Proportional to 81.75 and 109.25

Step by Step Solution

1. Step 1: Write the proportion equation
   81.75 : 109.25 = 109.25 : x
2. Step 2: Convert to fraction form
   81.75/109.25 = 109.25/x
3. Step 3: Cross multiply
   81.75x = 109.25 × 109.25
4. Step 4: Simplify right side
   81.75x = 11,935.56
5. Step 5: Solve for x
   x = 11,935.56/81.75
6. Step 6: Final answer
   x = 146.00