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Finding the Fourth Proportional to 10.91, 16.29 and 8.90

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Solution

The fourth proportional to 10.91, 16.29 and 8.90 is: 13.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    10.91 : 16.29 = 8.90 : x
  2. Step 2: Convert to fraction form
    10.91/16.29 = 8.90/x
  3. Step 3: Cross multiply
    10.91x = 16.29 × 8.90
  4. Step 4: Simplify right side
    10.91x = 144.90
  5. Step 5: Solve for x
    x = 144.90/10.91
  6. Step 6: Final answer
    x = 13.29

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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.