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Finding the Fourth Proportional to 276.55, 381.31 and 197.78

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Solution

The fourth proportional to 276.55, 381.31 and 197.78 is: 272.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    276.55 : 381.31 = 197.78 : x
  2. Step 2: Convert to fraction form
    276.55/381.31 = 197.78/x
  3. Step 3: Cross multiply
    276.55x = 381.31 × 197.78
  4. Step 4: Simplify right side
    276.55x = 75,413.09
  5. Step 5: Solve for x
    x = 75,413.09/276.55
  6. Step 6: Final answer
    x = 272.69

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.