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Finding the Fourth Proportional to 8.69, 12.93 and 8.66

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Solution

The fourth proportional to 8.69, 12.93 and 8.66 is: 12.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    8.69 : 12.93 = 8.66 : x
  2. Step 2: Convert to fraction form
    8.69/12.93 = 8.66/x
  3. Step 3: Cross multiply
    8.69x = 12.93 × 8.66
  4. Step 4: Simplify right side
    8.69x = 111.92
  5. Step 5: Solve for x
    x = 111.92/8.69
  6. Step 6: Final answer
    x = 12.88

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.