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Finding the Fourth Proportional to 38.73, 57.90 and 28.38

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Solution

The fourth proportional to 38.73, 57.90 and 28.38 is: 42.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    38.73 : 57.90 = 28.38 : x
  2. Step 2: Convert to fraction form
    38.73/57.90 = 28.38/x
  3. Step 3: Cross multiply
    38.73x = 57.90 × 28.38
  4. Step 4: Simplify right side
    38.73x = 1,643.20
  5. Step 5: Solve for x
    x = 1,643.20/38.73
  6. Step 6: Final answer
    x = 42.43

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.