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Finding the Fourth Proportional to 278.86, 418.17 and 122.62

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Solution

The fourth proportional to 278.86, 418.17 and 122.62 is: 183.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.86 : 418.17 = 122.62 : x
  2. Step 2: Convert to fraction form
    278.86/418.17 = 122.62/x
  3. Step 3: Cross multiply
    278.86x = 418.17 × 122.62
  4. Step 4: Simplify right side
    278.86x = 51,276.01
  5. Step 5: Solve for x
    x = 51,276.01/278.86
  6. Step 6: Final answer
    x = 183.88

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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.