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Finding the Fourth Proportional to 425,885.80, 638,828.70 and 126,412.60

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Solution

The fourth proportional to 425,885.80, 638,828.70 and 126,412.60 is: 189,618.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    425,885.80 : 638,828.70 = 126,412.60 : x
  2. Step 2: Convert to fraction form
    425,885.80/638,828.70 = 126,412.60/x
  3. Step 3: Cross multiply
    425,885.80x = 638,828.70 × 126,412.60
  4. Step 4: Simplify right side
    425,885.80x = 80,755,996,921.62
  5. Step 5: Solve for x
    x = 80,755,996,921.62/425,885.80
  6. Step 6: Final answer
    x = 189,618.90

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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.