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Finding the Fourth Proportional to 20.96, 31.43 and 7.94

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Solution

The fourth proportional to 20.96, 31.43 and 7.94 is: 11.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    20.96 : 31.43 = 7.94 : x
  2. Step 2: Convert to fraction form
    20.96/31.43 = 7.94/x
  3. Step 3: Cross multiply
    20.96x = 31.43 × 7.94
  4. Step 4: Simplify right side
    20.96x = 249.55
  5. Step 5: Solve for x
    x = 249.55/20.96
  6. Step 6: Final answer
    x = 11.91

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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.