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Finding the Fourth Proportional to 10.88, 16.24 and 9.91

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Solution

The fourth proportional to 10.88, 16.24 and 9.91 is: 14.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    10.88 : 16.24 = 9.91 : x
  2. Step 2: Convert to fraction form
    10.88/16.24 = 9.91/x
  3. Step 3: Cross multiply
    10.88x = 16.24 × 9.91
  4. Step 4: Simplify right side
    10.88x = 160.94
  5. Step 5: Solve for x
    x = 160.94/10.88
  6. Step 6: Final answer
    x = 14.79

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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.