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Finding the Fourth Proportional to 28.43, 39.21 and 22.28

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Solution

The fourth proportional to 28.43, 39.21 and 22.28 is: 30.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    28.43 : 39.21 = 22.28 : x
  2. Step 2: Convert to fraction form
    28.43/39.21 = 22.28/x
  3. Step 3: Cross multiply
    28.43x = 39.21 × 22.28
  4. Step 4: Simplify right side
    28.43x = 873.40
  5. Step 5: Solve for x
    x = 873.40/28.43
  6. Step 6: Final answer
    x = 30.73

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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.