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Finding the Fourth Proportional to 282.72, 422.72 and 239.90

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Solution

The fourth proportional to 282.72, 422.72 and 239.90 is: 358.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    282.72 : 422.72 = 239.90 : x
  2. Step 2: Convert to fraction form
    282.72/422.72 = 239.90/x
  3. Step 3: Cross multiply
    282.72x = 422.72 × 239.90
  4. Step 4: Simplify right side
    282.72x = 101,408.11
  5. Step 5: Solve for x
    x = 101,408.11/282.72
  6. Step 6: Final answer
    x = 358.68

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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.