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Finding the Fourth Proportional to 425,897.60, 638,846.40 and 391,491.20

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Solution

The fourth proportional to 425,897.60, 638,846.40 and 391,491.20 is: 587,236.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    425,897.60 : 638,846.40 = 391,491.20 : x
  2. Step 2: Convert to fraction form
    425,897.60/638,846.40 = 391,491.20/x
  3. Step 3: Cross multiply
    425,897.60x = 638,846.40 × 391,491.20
  4. Step 4: Simplify right side
    425,897.60x = 250,102,743,751.68
  5. Step 5: Solve for x
    x = 250,102,743,751.68/425,897.60
  6. Step 6: Final answer
    x = 587,236.80

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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.