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Finding the Fourth Proportional to 278.50, 418.70 and 255.73

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Solution

The fourth proportional to 278.50, 418.70 and 255.73 is: 384.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.50 : 418.70 = 255.73 : x
  2. Step 2: Convert to fraction form
    278.50/418.70 = 255.73/x
  3. Step 3: Cross multiply
    278.50x = 418.70 × 255.73
  4. Step 4: Simplify right side
    278.50x = 107,074.15
  5. Step 5: Solve for x
    x = 107,074.15/278.50
  6. Step 6: Final answer
    x = 384.47

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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.