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Finding the Fourth Proportional to 425,574.59, 638,455.32 and 126,078.62

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Solution

The fourth proportional to 425,574.59, 638,455.32 and 126,078.62 is: 189,145.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    425,574.59 : 638,455.32 = 126,078.62 : x
  2. Step 2: Convert to fraction form
    425,574.59/638,455.32 = 126,078.62/x
  3. Step 3: Cross multiply
    425,574.59x = 638,455.32 × 126,078.62
  4. Step 4: Simplify right side
    425,574.59x = 80,495,562,484.98
  5. Step 5: Solve for x
    x = 80,495,562,484.98/425,574.59
  6. Step 6: Final answer
    x = 189,145.61

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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.