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Finding the Fourth Proportional to 20.20, 27.81 and 17.89

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Solution

The fourth proportional to 20.20, 27.81 and 17.89 is: 24.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    20.20 : 27.81 = 17.89 : x
  2. Step 2: Convert to fraction form
    20.20/27.81 = 17.89/x
  3. Step 3: Cross multiply
    20.20x = 27.81 × 17.89
  4. Step 4: Simplify right side
    20.20x = 497.52
  5. Step 5: Solve for x
    x = 497.52/20.20
  6. Step 6: Final answer
    x = 24.63

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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.