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Finding the Fourth Proportional to 278.56, 418.11 and 134.38

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Solution

The fourth proportional to 278.56, 418.11 and 134.38 is: 201.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.56 : 418.11 = 134.38 : x
  2. Step 2: Convert to fraction form
    278.56/418.11 = 134.38/x
  3. Step 3: Cross multiply
    278.56x = 418.11 × 134.38
  4. Step 4: Simplify right side
    278.56x = 56,185.62
  5. Step 5: Solve for x
    x = 56,185.62/278.56
  6. Step 6: Final answer
    x = 201.70

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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.