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Finding the Fourth Proportional to 276.72, 381.70 and 221.38

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Solution

The fourth proportional to 276.72, 381.70 and 221.38 is: 305.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    276.72 : 381.70 = 221.38 : x
  2. Step 2: Convert to fraction form
    276.72/381.70 = 221.38/x
  3. Step 3: Cross multiply
    276.72x = 381.70 × 221.38
  4. Step 4: Simplify right side
    276.72x = 84,500.75
  5. Step 5: Solve for x
    x = 84,500.75/276.72
  6. Step 6: Final answer
    x = 305.37

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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.