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Finding the Fourth Proportional to 425,833.60, 638,750.40 and 391,427.20

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Solution

The fourth proportional to 425,833.60, 638,750.40 and 391,427.20 is: 587,140.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    425,833.60 : 638,750.40 = 391,427.20 : x
  2. Step 2: Convert to fraction form
    425,833.60/638,750.40 = 391,427.20/x
  3. Step 3: Cross multiply
    425,833.60x = 638,750.40 × 391,427.20
  4. Step 4: Simplify right side
    425,833.60x = 250,024,280,570.88
  5. Step 5: Solve for x
    x = 250,024,280,570.88/425,833.60
  6. Step 6: Final answer
    x = 587,140.80

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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.