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Finding the Fourth Proportional to 20.09, 27.71 and 11.89

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Solution

The fourth proportional to 20.09, 27.71 and 11.89 is: 16.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    20.09 : 27.71 = 11.89 : x
  2. Step 2: Convert to fraction form
    20.09/27.71 = 11.89/x
  3. Step 3: Cross multiply
    20.09x = 27.71 × 11.89
  4. Step 4: Simplify right side
    20.09x = 329.41
  5. Step 5: Solve for x
    x = 329.41/20.09
  6. Step 6: Final answer
    x = 16.40

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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.