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Finding the Fourth Proportional to 13.67, 18.85 and 8.49

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Solution

The fourth proportional to 13.67, 18.85 and 8.49 is: 11.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    13.67 : 18.85 = 8.49 : x
  2. Step 2: Convert to fraction form
    13.67/18.85 = 8.49/x
  3. Step 3: Cross multiply
    13.67x = 18.85 × 8.49
  4. Step 4: Simplify right side
    13.67x = 159.94
  5. Step 5: Solve for x
    x = 159.94/13.67
  6. Step 6: Final answer
    x = 11.70

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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.