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Finding the Fourth Proportional to 20.93, 28.81 and 20.25

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Solution

The fourth proportional to 20.93, 28.81 and 20.25 is: 27.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    20.93 : 28.81 = 20.25 : x
  2. Step 2: Convert to fraction form
    20.93/28.81 = 20.25/x
  3. Step 3: Cross multiply
    20.93x = 28.81 × 20.25
  4. Step 4: Simplify right side
    20.93x = 583.40
  5. Step 5: Solve for x
    x = 583.40/20.93
  6. Step 6: Final answer
    x = 27.87

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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.