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Finding the Fourth Proportional to 42.11, 63.12 and 20.43

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Solution

The fourth proportional to 42.11, 63.12 and 20.43 is: 30.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    42.11 : 63.12 = 20.43 : x
  2. Step 2: Convert to fraction form
    42.11/63.12 = 20.43/x
  3. Step 3: Cross multiply
    42.11x = 63.12 × 20.43
  4. Step 4: Simplify right side
    42.11x = 1,289.54
  5. Step 5: Solve for x
    x = 1,289.54/42.11
  6. Step 6: Final answer
    x = 30.63

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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.