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Finding the Fourth Proportional to 279.31, 418.56 and 221.27

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Solution

The fourth proportional to 279.31, 418.56 and 221.27 is: 331.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.31 : 418.56 = 221.27 : x
  2. Step 2: Convert to fraction form
    279.31/418.56 = 221.27/x
  3. Step 3: Cross multiply
    279.31x = 418.56 × 221.27
  4. Step 4: Simplify right side
    279.31x = 92,614.77
  5. Step 5: Solve for x
    x = 92,614.77/279.31
  6. Step 6: Final answer
    x = 331.58

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.