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Finding the Fourth Proportional to 11.85, 16.32 and 9.42

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Solution

The fourth proportional to 11.85, 16.32 and 9.42 is: 12.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    11.85 : 16.32 = 9.42 : x
  2. Step 2: Convert to fraction form
    11.85/16.32 = 9.42/x
  3. Step 3: Cross multiply
    11.85x = 16.32 × 9.42
  4. Step 4: Simplify right side
    11.85x = 153.73
  5. Step 5: Solve for x
    x = 153.73/11.85
  6. Step 6: Final answer
    x = 12.97

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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.