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Finding the Fourth Proportional to 425,574.88, 638,455.68 and 126,078.87

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Solution

The fourth proportional to 425,574.88, 638,455.68 and 126,078.87 is: 189,145.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    425,574.88 : 638,455.68 = 126,078.87 : x
  2. Step 2: Convert to fraction form
    425,574.88/638,455.68 = 126,078.87/x
  3. Step 3: Cross multiply
    425,574.88x = 638,455.68 × 126,078.87
  4. Step 4: Simplify right side
    425,574.88x = 80,495,770,679.48
  5. Step 5: Solve for x
    x = 80,495,770,679.48/425,574.88
  6. Step 6: Final answer
    x = 189,145.96

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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.