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Finding the Fourth Proportional to 8.47, 11.67 and 6.85

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Solution

The fourth proportional to 8.47, 11.67 and 6.85 is: 9.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    8.47 : 11.67 = 6.85 : x
  2. Step 2: Convert to fraction form
    8.47/11.67 = 6.85/x
  3. Step 3: Cross multiply
    8.47x = 11.67 × 6.85
  4. Step 4: Simplify right side
    8.47x = 79.94
  5. Step 5: Solve for x
    x = 79.94/8.47
  6. Step 6: Final answer
    x = 9.44

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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.