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Finding the Fourth Proportional to 323,540.40, 485,310.60 and 278,439.60

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Solution

The fourth proportional to 323,540.40, 485,310.60 and 278,439.60 is: 417,659.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    323,540.40 : 485,310.60 = 278,439.60 : x
  2. Step 2: Convert to fraction form
    323,540.40/485,310.60 = 278,439.60/x
  3. Step 3: Cross multiply
    323,540.40x = 485,310.60 × 278,439.60
  4. Step 4: Simplify right side
    323,540.40x = 135,129,689,339.76
  5. Step 5: Solve for x
    x = 135,129,689,339.76/323,540.40
  6. Step 6: Final answer
    x = 417,659.40

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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.