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Finding the Fourth Proportional to 8.81, 13.22 and 5.43

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Solution

The fourth proportional to 8.81, 13.22 and 5.43 is: 8.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    8.81 : 13.22 = 5.43 : x
  2. Step 2: Convert to fraction form
    8.81/13.22 = 5.43/x
  3. Step 3: Cross multiply
    8.81x = 13.22 × 5.43
  4. Step 4: Simplify right side
    8.81x = 71.78
  5. Step 5: Solve for x
    x = 71.78/8.81
  6. Step 6: Final answer
    x = 8.15

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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.