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Finding the Fourth Proportional to 28.92, 39.90 and 22.78

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Solution

The fourth proportional to 28.92, 39.90 and 22.78 is: 31.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    28.92 : 39.90 = 22.78 : x
  2. Step 2: Convert to fraction form
    28.92/39.90 = 22.78/x
  3. Step 3: Cross multiply
    28.92x = 39.90 × 22.78
  4. Step 4: Simplify right side
    28.92x = 908.92
  5. Step 5: Solve for x
    x = 908.92/28.92
  6. Step 6: Final answer
    x = 31.43

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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.