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Finding the Fourth Proportional to 20.93, 28.91 and 19.85

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Solution

The fourth proportional to 20.93, 28.91 and 19.85 is: 27.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    20.93 : 28.91 = 19.85 : x
  2. Step 2: Convert to fraction form
    20.93/28.91 = 19.85/x
  3. Step 3: Cross multiply
    20.93x = 28.91 × 19.85
  4. Step 4: Simplify right side
    20.93x = 573.62
  5. Step 5: Solve for x
    x = 573.62/20.93
  6. Step 6: Final answer
    x = 27.41

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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.