Finding the Third Proportional to 172.50 and 361.50

Step by Step Solution

1. Step 1: Write the proportion equation
   172.50 : 361.50 = 361.50 : x
2. Step 2: Convert to fraction form
   172.50/361.50 = 361.50/x
3. Step 3: Cross multiply
   172.50x = 361.50 × 361.50
4. Step 4: Simplify right side
   172.50x = 130,682.25
5. Step 5: Solve for x
   x = 130,682.25/172.50
6. Step 6: Final answer
   x = 757.58