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Finding the Fourth Proportional to 20.19, 28.04 and 19.86

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Solution

The fourth proportional to 20.19, 28.04 and 19.86 is: 27.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    20.19 : 28.04 = 19.86 : x
  2. Step 2: Convert to fraction form
    20.19/28.04 = 19.86/x
  3. Step 3: Cross multiply
    20.19x = 28.04 × 19.86
  4. Step 4: Simplify right side
    20.19x = 556.87
  5. Step 5: Solve for x
    x = 556.87/20.19
  6. Step 6: Final answer
    x = 27.58

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.