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Finding the Fourth Proportional to 38.04, 57.03 and 20.90

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Solution

The fourth proportional to 38.04, 57.03 and 20.90 is: 31.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    38.04 : 57.03 = 20.90 : x
  2. Step 2: Convert to fraction form
    38.04/57.03 = 20.90/x
  3. Step 3: Cross multiply
    38.04x = 57.03 × 20.90
  4. Step 4: Simplify right side
    38.04x = 1,191.93
  5. Step 5: Solve for x
    x = 1,191.93/38.04
  6. Step 6: Final answer
    x = 31.33

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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.