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Finding the Fourth Proportional to 278,876.10, 418,314.15 and 68,511.30

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Solution

The fourth proportional to 278,876.10, 418,314.15 and 68,511.30 is: 102,766.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    278,876.10 : 418,314.15 = 68,511.30 : x
  2. Step 2: Convert to fraction form
    278,876.10/418,314.15 = 68,511.30/x
  3. Step 3: Cross multiply
    278,876.10x = 418,314.15 × 68,511.30
  4. Step 4: Simplify right side
    278,876.10x = 28,659,246,224.90
  5. Step 5: Solve for x
    x = 28,659,246,224.90/278,876.10
  6. Step 6: Final answer
    x = 102,766.95

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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.