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Finding the Fourth Proportional to 398,781.94, 550,007.89 and 255,555.31

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Solution

The fourth proportional to 398,781.94, 550,007.89 and 255,555.31 is: 352,466.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,781.94 : 550,007.89 = 255,555.31 : x
  2. Step 2: Convert to fraction form
    398,781.94/550,007.89 = 255,555.31/x
  3. Step 3: Cross multiply
    398,781.94x = 550,007.89 × 255,555.31
  4. Step 4: Simplify right side
    398,781.94x = 140,557,436,831.40
  5. Step 5: Solve for x
    x = 140,557,436,831.40/398,781.94
  6. Step 6: Final answer
    x = 352,466.91

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.