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Finding the Fourth Proportional to 8.66, 13.06 and 8.47

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Solution

The fourth proportional to 8.66, 13.06 and 8.47 is: 12.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    8.66 : 13.06 = 8.47 : x
  2. Step 2: Convert to fraction form
    8.66/13.06 = 8.47/x
  3. Step 3: Cross multiply
    8.66x = 13.06 × 8.47
  4. Step 4: Simplify right side
    8.66x = 110.65
  5. Step 5: Solve for x
    x = 110.65/8.66
  6. Step 6: Final answer
    x = 12.78

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.