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Finding the Fourth Proportional to 11.20, 16.89 and 11.09

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Solution

The fourth proportional to 11.20, 16.89 and 11.09 is: 16.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    11.20 : 16.89 = 11.09 : x
  2. Step 2: Convert to fraction form
    11.20/16.89 = 11.09/x
  3. Step 3: Cross multiply
    11.20x = 16.89 × 11.09
  4. Step 4: Simplify right side
    11.20x = 187.31
  5. Step 5: Solve for x
    x = 187.31/11.20
  6. Step 6: Final answer
    x = 16.72

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.