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Finding the Fourth Proportional to 667,078.72, 920,569.22 and 361,155.30

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Solution

The fourth proportional to 667,078.72, 920,569.22 and 361,155.30 is: 498,394.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    667,078.72 : 920,569.22 = 361,155.30 : x
  2. Step 2: Convert to fraction form
    667,078.72/920,569.22 = 361,155.30/x
  3. Step 3: Cross multiply
    667,078.72x = 920,569.22 × 361,155.30
  4. Step 4: Simplify right side
    667,078.72x = 332,468,452,819.87
  5. Step 5: Solve for x
    x = 332,468,452,819.87/667,078.72
  6. Step 6: Final answer
    x = 498,394.63

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.