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Finding the Fourth Proportional to 278.10, 418.77 and 255.42

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Solution

The fourth proportional to 278.10, 418.77 and 255.42 is: 384.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.10 : 418.77 = 255.42 : x
  2. Step 2: Convert to fraction form
    278.10/418.77 = 255.42/x
  3. Step 3: Cross multiply
    278.10x = 418.77 × 255.42
  4. Step 4: Simplify right side
    278.10x = 106,962.23
  5. Step 5: Solve for x
    x = 106,962.23/278.10
  6. Step 6: Final answer
    x = 384.62

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.