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Finding the Fourth Proportional to 8.61, 11.89 and 5.38

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Solution

The fourth proportional to 8.61, 11.89 and 5.38 is: 7.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    8.61 : 11.89 = 5.38 : x
  2. Step 2: Convert to fraction form
    8.61/11.89 = 5.38/x
  3. Step 3: Cross multiply
    8.61x = 11.89 × 5.38
  4. Step 4: Simplify right side
    8.61x = 63.88
  5. Step 5: Solve for x
    x = 63.88/8.61
  6. Step 6: Final answer
    x = 7.42

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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.