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Finding the Fourth Proportional to 425,830.60, 638,745.90 and 391,424.20

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Solution

The fourth proportional to 425,830.60, 638,745.90 and 391,424.20 is: 587,136.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    425,830.60 : 638,745.90 = 391,424.20 : x
  2. Step 2: Convert to fraction form
    425,830.60/638,745.90 = 391,424.20/x
  3. Step 3: Cross multiply
    425,830.60x = 638,745.90 × 391,424.20
  4. Step 4: Simplify right side
    425,830.60x = 250,020,602,910.78
  5. Step 5: Solve for x
    x = 250,020,602,910.78/425,830.60
  6. Step 6: Final answer
    x = 587,136.30

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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.