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Finding the Fourth Proportional to 8.81, 12.21 and 8.50

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Solution

The fourth proportional to 8.81, 12.21 and 8.50 is: 11.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    8.81 : 12.21 = 8.50 : x
  2. Step 2: Convert to fraction form
    8.81/12.21 = 8.50/x
  3. Step 3: Cross multiply
    8.81x = 12.21 × 8.50
  4. Step 4: Simplify right side
    8.81x = 103.72
  5. Step 5: Solve for x
    x = 103.72/8.81
  6. Step 6: Final answer
    x = 11.77

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.