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Finding the Fourth Proportional to 8.78, 13.17 and 8.02

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Solution

The fourth proportional to 8.78, 13.17 and 8.02 is: 12.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    8.78 : 13.17 = 8.02 : x
  2. Step 2: Convert to fraction form
    8.78/13.17 = 8.02/x
  3. Step 3: Cross multiply
    8.78x = 13.17 × 8.02
  4. Step 4: Simplify right side
    8.78x = 105.62
  5. Step 5: Solve for x
    x = 105.62/8.78
  6. Step 6: Final answer
    x = 12.03

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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.