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Finding the Fourth Proportional to 11.21, 16.81 and 5.50

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Solution

The fourth proportional to 11.21, 16.81 and 5.50 is: 8.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    11.21 : 16.81 = 5.50 : x
  2. Step 2: Convert to fraction form
    11.21/16.81 = 5.50/x
  3. Step 3: Cross multiply
    11.21x = 16.81 × 5.50
  4. Step 4: Simplify right side
    11.21x = 92.46
  5. Step 5: Solve for x
    x = 92.46/11.21
  6. Step 6: Final answer
    x = 8.25

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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.