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Finding the Fourth Proportional to 278.78, 418.28 and 105.44

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Solution

The fourth proportional to 278.78, 418.28 and 105.44 is: 158.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.78 : 418.28 = 105.44 : x
  2. Step 2: Convert to fraction form
    278.78/418.28 = 105.44/x
  3. Step 3: Cross multiply
    278.78x = 418.28 × 105.44
  4. Step 4: Simplify right side
    278.78x = 44,100.82
  5. Step 5: Solve for x
    x = 44,100.82/278.78
  6. Step 6: Final answer
    x = 158.20

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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.