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Finding the Fourth Proportional to 542.27, 814.15 and 278.91

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Solution

The fourth proportional to 542.27, 814.15 and 278.91 is: 418.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    542.27 : 814.15 = 278.91 : x
  2. Step 2: Convert to fraction form
    542.27/814.15 = 278.91/x
  3. Step 3: Cross multiply
    542.27x = 814.15 × 278.91
  4. Step 4: Simplify right side
    542.27x = 227,069.11
  5. Step 5: Solve for x
    x = 227,069.11/542.27
  6. Step 6: Final answer
    x = 418.74

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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.