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Finding the Fourth Proportional to 425,854.20, 638,781.30 and 313,879.80

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Solution

The fourth proportional to 425,854.20, 638,781.30 and 313,879.80 is: 470,819.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    425,854.20 : 638,781.30 = 313,879.80 : x
  2. Step 2: Convert to fraction form
    425,854.20/638,781.30 = 313,879.80/x
  3. Step 3: Cross multiply
    425,854.20x = 638,781.30 × 313,879.80
  4. Step 4: Simplify right side
    425,854.20x = 200,500,546,687.74
  5. Step 5: Solve for x
    x = 200,500,546,687.74/425,854.20
  6. Step 6: Final answer
    x = 470,819.70

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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.