Finding the Third Proportional to 216.50 and 344.50

Step by Step Solution

1. Step 1: Write the proportion equation
   216.50 : 344.50 = 344.50 : x
2. Step 2: Convert to fraction form
   216.50/344.50 = 344.50/x
3. Step 3: Cross multiply
   216.50x = 344.50 × 344.50
4. Step 4: Simplify right side
   216.50x = 118,680.25
5. Step 5: Solve for x
   x = 118,680.25/216.50
6. Step 6: Final answer
   x = 548.18