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Finding the Fourth Proportional to 278,534.10, 417,801.15 and 260,819.40

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Solution

The fourth proportional to 278,534.10, 417,801.15 and 260,819.40 is: 391,229.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    278,534.10 : 417,801.15 = 260,819.40 : x
  2. Step 2: Convert to fraction form
    278,534.10/417,801.15 = 260,819.40/x
  3. Step 3: Cross multiply
    278,534.10x = 417,801.15 × 260,819.40
  4. Step 4: Simplify right side
    278,534.10x = 108,970,645,262.31
  5. Step 5: Solve for x
    x = 108,970,645,262.31/278,534.10
  6. Step 6: Final answer
    x = 391,229.10

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1.5x scale

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.