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Finding the Fourth Proportional to 22.87, 31.42 and 20.84

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Solution

The fourth proportional to 22.87, 31.42 and 20.84 is: 28.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    22.87 : 31.42 = 20.84 : x
  2. Step 2: Convert to fraction form
    22.87/31.42 = 20.84/x
  3. Step 3: Cross multiply
    22.87x = 31.42 × 20.84
  4. Step 4: Simplify right side
    22.87x = 654.79
  5. Step 5: Solve for x
    x = 654.79/22.87
  6. Step 6: Final answer
    x = 28.63

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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.