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Finding the Fourth Proportional to 11.16, 16.71 and 9.89

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Solution

The fourth proportional to 11.16, 16.71 and 9.89 is: 14.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    11.16 : 16.71 = 9.89 : x
  2. Step 2: Convert to fraction form
    11.16/16.71 = 9.89/x
  3. Step 3: Cross multiply
    11.16x = 16.71 × 9.89
  4. Step 4: Simplify right side
    11.16x = 165.30
  5. Step 5: Solve for x
    x = 165.30/11.16
  6. Step 6: Final answer
    x = 14.81

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.