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Finding the Fourth Proportional to 20.98, 31.42 and 11.96

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Solution

The fourth proportional to 20.98, 31.42 and 11.96 is: 17.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    20.98 : 31.42 = 11.96 : x
  2. Step 2: Convert to fraction form
    20.98/31.42 = 11.96/x
  3. Step 3: Cross multiply
    20.98x = 31.42 × 11.96
  4. Step 4: Simplify right side
    20.98x = 375.60
  5. Step 5: Solve for x
    x = 375.60/20.98
  6. Step 6: Final answer
    x = 17.90

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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.