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Finding the Fourth Proportional to 276.38, 381.42 and 159.98

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Solution

The fourth proportional to 276.38, 381.42 and 159.98 is: 220.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    276.38 : 381.42 = 159.98 : x
  2. Step 2: Convert to fraction form
    276.38/381.42 = 159.98/x
  3. Step 3: Cross multiply
    276.38x = 381.42 × 159.98
  4. Step 4: Simplify right side
    276.38x = 61,019.57
  5. Step 5: Solve for x
    x = 61,019.57/276.38
  6. Step 6: Final answer
    x = 220.78

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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.