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Finding the Fourth Proportional to 278.39, 417.87 and 204.36

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Solution

The fourth proportional to 278.39, 417.87 and 204.36 is: 306.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.39 : 417.87 = 204.36 : x
  2. Step 2: Convert to fraction form
    278.39/417.87 = 204.36/x
  3. Step 3: Cross multiply
    278.39x = 417.87 × 204.36
  4. Step 4: Simplify right side
    278.39x = 85,395.91
  5. Step 5: Solve for x
    x = 85,395.91/278.39
  6. Step 6: Final answer
    x = 306.75

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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.