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Finding the Fourth Proportional to 276.41, 381.21 and 221.13

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Solution

The fourth proportional to 276.41, 381.21 and 221.13 is: 304.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    276.41 : 381.21 = 221.13 : x
  2. Step 2: Convert to fraction form
    276.41/381.21 = 221.13/x
  3. Step 3: Cross multiply
    276.41x = 381.21 × 221.13
  4. Step 4: Simplify right side
    276.41x = 84,296.14
  5. Step 5: Solve for x
    x = 84,296.14/276.41
  6. Step 6: Final answer
    x = 304.97

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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.