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Finding the Fourth Proportional to 12.67, 18.91 and 12.42

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Solution

The fourth proportional to 12.67, 18.91 and 12.42 is: 18.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    12.67 : 18.91 = 12.42 : x
  2. Step 2: Convert to fraction form
    12.67/18.91 = 12.42/x
  3. Step 3: Cross multiply
    12.67x = 18.91 × 12.42
  4. Step 4: Simplify right side
    12.67x = 234.86
  5. Step 5: Solve for x
    x = 234.86/12.67
  6. Step 6: Final answer
    x = 18.54

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.