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Finding the Fourth Proportional to 398,916.18, 550,335.33 and 255,630.42

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Solution

The fourth proportional to 398,916.18, 550,335.33 and 255,630.42 is: 352,661.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,916.18 : 550,335.33 = 255,630.42 : x
  2. Step 2: Convert to fraction form
    398,916.18/550,335.33 = 255,630.42/x
  3. Step 3: Cross multiply
    398,916.18x = 550,335.33 × 255,630.42
  4. Step 4: Simplify right side
    398,916.18x = 140,682,451,548.74
  5. Step 5: Solve for x
    x = 140,682,451,548.74/398,916.18
  6. Step 6: Final answer
    x = 352,661.68

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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.