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Finding the Fourth Proportional to 425,633.58, 638,543.76 and 126,137.61

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Solution

The fourth proportional to 425,633.58, 638,543.76 and 126,137.61 is: 189,234.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    425,633.58 : 638,543.76 = 126,137.61 : x
  2. Step 2: Convert to fraction form
    425,633.58/638,543.76 = 126,137.61/x
  3. Step 3: Cross multiply
    425,633.58x = 638,543.76 × 126,137.61
  4. Step 4: Simplify right side
    425,633.58x = 80,544,383,766.81
  5. Step 5: Solve for x
    x = 80,544,383,766.81/425,633.58
  6. Step 6: Final answer
    x = 189,234.09

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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.