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Finding the Fourth Proportional to 22.57, 30.90 and 21.79

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Solution

The fourth proportional to 22.57, 30.90 and 21.79 is: 29.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    22.57 : 30.90 = 21.79 : x
  2. Step 2: Convert to fraction form
    22.57/30.90 = 21.79/x
  3. Step 3: Cross multiply
    22.57x = 30.90 × 21.79
  4. Step 4: Simplify right side
    22.57x = 673.05
  5. Step 5: Solve for x
    x = 673.05/22.57
  6. Step 6: Final answer
    x = 29.83

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.