Finding the Third Proportional to 142.50 and 215.25

Step by Step Solution

1. Step 1: Write the proportion equation
   142.50 : 215.25 = 215.25 : x
2. Step 2: Convert to fraction form
   142.50/215.25 = 215.25/x
3. Step 3: Cross multiply
   142.50x = 215.25 × 215.25
4. Step 4: Simplify right side
   142.50x = 46,332.56
5. Step 5: Solve for x
   x = 46,332.56/142.50
6. Step 6: Final answer
   x = 325.14