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Finding the Fourth Proportional to 391,641.20, 587,461.80 and 371,423.60

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Solution

The fourth proportional to 391,641.20, 587,461.80 and 371,423.60 is: 557,135.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,641.20 : 587,461.80 = 371,423.60 : x
  2. Step 2: Convert to fraction form
    391,641.20/587,461.80 = 371,423.60/x
  3. Step 3: Cross multiply
    391,641.20x = 587,461.80 × 371,423.60
  4. Step 4: Simplify right side
    391,641.20x = 218,197,176,618.48
  5. Step 5: Solve for x
    x = 218,197,176,618.48/391,641.20
  6. Step 6: Final answer
    x = 557,135.40

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.