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Finding the Fourth Proportional to 13.18, 18.11 and 12.03

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Solution

The fourth proportional to 13.18, 18.11 and 12.03 is: 16.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    13.18 : 18.11 = 12.03 : x
  2. Step 2: Convert to fraction form
    13.18/18.11 = 12.03/x
  3. Step 3: Cross multiply
    13.18x = 18.11 × 12.03
  4. Step 4: Simplify right side
    13.18x = 217.86
  5. Step 5: Solve for x
    x = 217.86/13.18
  6. Step 6: Final answer
    x = 16.53

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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.