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Finding the Fourth Proportional to 276.48, 381.27 and 221.06

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Solution

The fourth proportional to 276.48, 381.27 and 221.06 is: 304.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    276.48 : 381.27 = 221.06 : x
  2. Step 2: Convert to fraction form
    276.48/381.27 = 221.06/x
  3. Step 3: Cross multiply
    276.48x = 381.27 × 221.06
  4. Step 4: Simplify right side
    276.48x = 84,285.33
  5. Step 5: Solve for x
    x = 84,285.33/276.48
  6. Step 6: Final answer
    x = 304.85

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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.