Finding the Third Proportional to 276.75 and 400.89

Step by Step Solution

1. Step 1: Write the proportion equation
   276.75 : 400.89 = 400.89 : x
2. Step 2: Convert to fraction form
   276.75/400.89 = 400.89/x
3. Step 3: Cross multiply
   276.75x = 400.89 × 400.89
4. Step 4: Simplify right side
   276.75x = 160,710.16
5. Step 5: Solve for x
   x = 160,710.16/276.75
6. Step 6: Final answer
   x = 580.71