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Finding the Fourth Proportional to 278.28, 417.42 and 255.42

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Solution

The fourth proportional to 278.28, 417.42 and 255.42 is: 383.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.28 : 417.42 = 255.42 : x
  2. Step 2: Convert to fraction form
    278.28/417.42 = 255.42/x
  3. Step 3: Cross multiply
    278.28x = 417.42 × 255.42
  4. Step 4: Simplify right side
    278.28x = 106,617.42
  5. Step 5: Solve for x
    x = 106,617.42/278.28
  6. Step 6: Final answer
    x = 383.13

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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.