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Finding the Fourth Proportional to 8.68, 12.05 and 8.61

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Solution

The fourth proportional to 8.68, 12.05 and 8.61 is: 11.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    8.68 : 12.05 = 8.61 : x
  2. Step 2: Convert to fraction form
    8.68/12.05 = 8.61/x
  3. Step 3: Cross multiply
    8.68x = 12.05 × 8.61
  4. Step 4: Simplify right side
    8.68x = 103.75
  5. Step 5: Solve for x
    x = 103.75/8.68
  6. Step 6: Final answer
    x = 11.95

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.