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Finding the Fourth Proportional to 38.73, 58.03 and 20.42

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Solution

The fourth proportional to 38.73, 58.03 and 20.42 is: 30.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    38.73 : 58.03 = 20.42 : x
  2. Step 2: Convert to fraction form
    38.73/58.03 = 20.42/x
  3. Step 3: Cross multiply
    38.73x = 58.03 × 20.42
  4. Step 4: Simplify right side
    38.73x = 1,184.97
  5. Step 5: Solve for x
    x = 1,184.97/38.73
  6. Step 6: Final answer
    x = 30.60

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.