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Finding the Fourth Proportional to 13.67, 20.49 and 8.58

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Solution

The fourth proportional to 13.67, 20.49 and 8.58 is: 12.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    13.67 : 20.49 = 8.58 : x
  2. Step 2: Convert to fraction form
    13.67/20.49 = 8.58/x
  3. Step 3: Cross multiply
    13.67x = 20.49 × 8.58
  4. Step 4: Simplify right side
    13.67x = 175.80
  5. Step 5: Solve for x
    x = 175.80/13.67
  6. Step 6: Final answer
    x = 12.86

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.