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Finding the Fourth Proportional to 425,775.36, 638,756.80 and 126,279.36

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Solution

The fourth proportional to 425,775.36, 638,756.80 and 126,279.36 is: 189,446.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    425,775.36 : 638,756.80 = 126,279.36 : x
  2. Step 2: Convert to fraction form
    425,775.36/638,756.80 = 126,279.36/x
  3. Step 3: Cross multiply
    425,775.36x = 638,756.80 × 126,279.36
  4. Step 4: Simplify right side
    425,775.36x = 80,661,799,899.65
  5. Step 5: Solve for x
    x = 80,661,799,899.65/425,775.36
  6. Step 6: Final answer
    x = 189,446.85

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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.