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Finding the Fourth Proportional to 279.27, 385.38 and 154.92

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Solution

The fourth proportional to 279.27, 385.38 and 154.92 is: 213.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.27 : 385.38 = 154.92 : x
  2. Step 2: Convert to fraction form
    279.27/385.38 = 154.92/x
  3. Step 3: Cross multiply
    279.27x = 385.38 × 154.92
  4. Step 4: Simplify right side
    279.27x = 59,704.88
  5. Step 5: Solve for x
    x = 59,704.88/279.27
  6. Step 6: Final answer
    x = 213.79

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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.