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Finding the Fourth Proportional to 8.91, 12.21 and 8.49

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Solution

The fourth proportional to 8.91, 12.21 and 8.49 is: 11.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    8.91 : 12.21 = 8.49 : x
  2. Step 2: Convert to fraction form
    8.91/12.21 = 8.49/x
  3. Step 3: Cross multiply
    8.91x = 12.21 × 8.49
  4. Step 4: Simplify right side
    8.91x = 103.66
  5. Step 5: Solve for x
    x = 103.66/8.91
  6. Step 6: Final answer
    x = 11.63

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.