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Finding the Fourth Proportional to 425,573.15, 638,453.17 and 126,077.18

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Solution

The fourth proportional to 425,573.15, 638,453.17 and 126,077.18 is: 189,143.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    425,573.15 : 638,453.17 = 126,077.18 : x
  2. Step 2: Convert to fraction form
    425,573.15/638,453.17 = 126,077.18/x
  3. Step 3: Cross multiply
    425,573.15x = 638,453.17 × 126,077.18
  4. Step 4: Simplify right side
    425,573.15x = 80,494,375,235.66
  5. Step 5: Solve for x
    x = 80,494,375,235.66/425,573.15
  6. Step 6: Final answer
    x = 189,143.45

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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.