Finding the Third Proportional to 90.75 and 103.55

Step by Step Solution

1. Step 1: Write the proportion equation
   90.75 : 103.55 = 103.55 : x
2. Step 2: Convert to fraction form
   90.75/103.55 = 103.55/x
3. Step 3: Cross multiply
   90.75x = 103.55 × 103.55
4. Step 4: Simplify right side
   90.75x = 10,721.96
5. Step 5: Solve for x
   x = 10,721.96/90.75
6. Step 6: Final answer
   x = 118.15