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Finding the Fourth Proportional to 22.10, 30.64 and 20.76

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Solution

The fourth proportional to 22.10, 30.64 and 20.76 is: 28.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    22.10 : 30.64 = 20.76 : x
  2. Step 2: Convert to fraction form
    22.10/30.64 = 20.76/x
  3. Step 3: Cross multiply
    22.10x = 30.64 × 20.76
  4. Step 4: Simplify right side
    22.10x = 636.09
  5. Step 5: Solve for x
    x = 636.09/22.10
  6. Step 6: Final answer
    x = 28.78

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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.