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Finding the Fourth Proportional to 20.39, 30.61 and 19.24

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Solution

The fourth proportional to 20.39, 30.61 and 19.24 is: 28.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    20.39 : 30.61 = 19.24 : x
  2. Step 2: Convert to fraction form
    20.39/30.61 = 19.24/x
  3. Step 3: Cross multiply
    20.39x = 30.61 × 19.24
  4. Step 4: Simplify right side
    20.39x = 588.88
  5. Step 5: Solve for x
    x = 588.88/20.39
  6. Step 6: Final answer
    x = 28.89

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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.