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Finding the Fourth Proportional to 278,487.38, 417,753.15 and 78,809.02

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Solution

The fourth proportional to 278,487.38, 417,753.15 and 78,809.02 is: 118,219.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    278,487.38 : 417,753.15 = 78,809.02 : x
  2. Step 2: Convert to fraction form
    278,487.38/417,753.15 = 78,809.02/x
  3. Step 3: Cross multiply
    278,487.38x = 417,753.15 × 78,809.02
  4. Step 4: Simplify right side
    278,487.38x = 32,922,715,013.50
  5. Step 5: Solve for x
    x = 32,922,715,013.50/278,487.38
  6. Step 6: Final answer
    x = 118,219.77

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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.