Finding the Third Proportional to 300.43 and 454.20

Step by Step Solution

1. Step 1: Write the proportion equation
   300.43 : 454.20 = 454.20 : x
2. Step 2: Convert to fraction form
   300.43/454.20 = 454.20/x
3. Step 3: Cross multiply
   300.43x = 454.20 × 454.20
4. Step 4: Simplify right side
   300.43x = 206,298.70
5. Step 5: Solve for x
   x = 206,298.70/300.43
6. Step 6: Final answer
   x = 686.68