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Finding the Fourth Proportional to 16.11, 22.17 and 15

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Solution

The fourth proportional to 16.11, 22.17 and 15 is: 20.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    16.11 : 22.17 = 15 : x
  2. Step 2: Convert to fraction form
    16.11/22.17 = 15/x
  3. Step 3: Cross multiply
    16.11x = 22.17 × 15
  4. Step 4: Simplify right side
    16.11x = 332.55
  5. Step 5: Solve for x
    x = 332.55/16.11
  6. Step 6: Final answer
    x = 20.64

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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.