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Finding the Fourth Proportional to 276.48, 381.60 and 197.88

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Solution

The fourth proportional to 276.48, 381.60 and 197.88 is: 273.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    276.48 : 381.60 = 197.88 : x
  2. Step 2: Convert to fraction form
    276.48/381.60 = 197.88/x
  3. Step 3: Cross multiply
    276.48x = 381.60 × 197.88
  4. Step 4: Simplify right side
    276.48x = 75,511.01
  5. Step 5: Solve for x
    x = 75,511.01/276.48
  6. Step 6: Final answer
    x = 273.12

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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.