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Finding the Fourth Proportional to 38.62, 57.90 and 20.59

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Solution

The fourth proportional to 38.62, 57.90 and 20.59 is: 30.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    38.62 : 57.90 = 20.59 : x
  2. Step 2: Convert to fraction form
    38.62/57.90 = 20.59/x
  3. Step 3: Cross multiply
    38.62x = 57.90 × 20.59
  4. Step 4: Simplify right side
    38.62x = 1,192.16
  5. Step 5: Solve for x
    x = 1,192.16/38.62
  6. Step 6: Final answer
    x = 30.87

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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.