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Finding the Fourth Proportional to 425,859.60, 638,789.40 and 391,453.20

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Solution

The fourth proportional to 425,859.60, 638,789.40 and 391,453.20 is: 587,179.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    425,859.60 : 638,789.40 = 391,453.20 : x
  2. Step 2: Convert to fraction form
    425,859.60/638,789.40 = 391,453.20/x
  3. Step 3: Cross multiply
    425,859.60x = 638,789.40 × 391,453.20
  4. Step 4: Simplify right side
    425,859.60x = 250,056,154,756.08
  5. Step 5: Solve for x
    x = 250,056,154,756.08/425,859.60
  6. Step 6: Final answer
    x = 587,179.80

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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.