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Finding the Fourth Proportional to 13.11, 17.99 and 12.12

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Solution

The fourth proportional to 13.11, 17.99 and 12.12 is: 16.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    13.11 : 17.99 = 12.12 : x
  2. Step 2: Convert to fraction form
    13.11/17.99 = 12.12/x
  3. Step 3: Cross multiply
    13.11x = 17.99 × 12.12
  4. Step 4: Simplify right side
    13.11x = 217.96
  5. Step 5: Solve for x
    x = 217.96/13.11
  6. Step 6: Final answer
    x = 16.63

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.