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Finding the Fourth Proportional to 12.17, 16.79 and 8.28

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Solution

The fourth proportional to 12.17, 16.79 and 8.28 is: 11.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    12.17 : 16.79 = 8.28 : x
  2. Step 2: Convert to fraction form
    12.17/16.79 = 8.28/x
  3. Step 3: Cross multiply
    12.17x = 16.79 × 8.28
  4. Step 4: Simplify right side
    12.17x = 138.98
  5. Step 5: Solve for x
    x = 138.98/12.17
  6. Step 6: Final answer
    x = 11.42

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.