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Finding the Fourth Proportional to 425,624.47, 638,530.11 and 126,128.49

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Solution

The fourth proportional to 425,624.47, 638,530.11 and 126,128.49 is: 189,220.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    425,624.47 : 638,530.11 = 126,128.49 : x
  2. Step 2: Convert to fraction form
    425,624.47/638,530.11 = 126,128.49/x
  3. Step 3: Cross multiply
    425,624.47x = 638,530.11 × 126,128.49
  4. Step 4: Simplify right side
    425,624.47x = 80,536,838,593.83
  5. Step 5: Solve for x
    x = 80,536,838,593.83/425,624.47
  6. Step 6: Final answer
    x = 189,220.41

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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.