Finding the Third Proportional to 215.16 and 314.30

Step by Step Solution

1. Step 1: Write the proportion equation
   215.16 : 314.30 = 314.30 : x
2. Step 2: Convert to fraction form
   215.16/314.30 = 314.30/x
3. Step 3: Cross multiply
   215.16x = 314.30 × 314.30
4. Step 4: Simplify right side
   215.16x = 98,782.53
5. Step 5: Solve for x
   x = 98,782.53/215.16
6. Step 6: Final answer
   x = 459.12