Finding the Third Proportional to 3.50 and 5.50

Step by Step Solution

1. Step 1: Write the proportion equation
   3.50 : 5.50 = 5.50 : x
2. Step 2: Convert to fraction form
   3.50/5.50 = 5.50/x
3. Step 3: Cross multiply
   3.50x = 5.50 × 5.50
4. Step 4: Simplify right side
   3.50x = 30.25
5. Step 5: Solve for x
   x = 30.25/3.50
6. Step 6: Final answer
   x = 8.64