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Finding the Fourth Proportional to 20.71, 28.57 and 11.96

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Solution

The fourth proportional to 20.71, 28.57 and 11.96 is: 16.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    20.71 : 28.57 = 11.96 : x
  2. Step 2: Convert to fraction form
    20.71/28.57 = 11.96/x
  3. Step 3: Cross multiply
    20.71x = 28.57 × 11.96
  4. Step 4: Simplify right side
    20.71x = 341.73
  5. Step 5: Solve for x
    x = 341.73/20.71
  6. Step 6: Final answer
    x = 16.50

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.