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Finding the Fourth Proportional to 22.12, 30.48 and 20.86

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Solution

The fourth proportional to 22.12, 30.48 and 20.86 is: 28.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    22.12 : 30.48 = 20.86 : x
  2. Step 2: Convert to fraction form
    22.12/30.48 = 20.86/x
  3. Step 3: Cross multiply
    22.12x = 30.48 × 20.86
  4. Step 4: Simplify right side
    22.12x = 635.66
  5. Step 5: Solve for x
    x = 635.66/22.12
  6. Step 6: Final answer
    x = 28.73

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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.