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Finding the Fourth Proportional to 20.25, 27.81 and 18.41

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Solution

The fourth proportional to 20.25, 27.81 and 18.41 is: 25.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    20.25 : 27.81 = 18.41 : x
  2. Step 2: Convert to fraction form
    20.25/27.81 = 18.41/x
  3. Step 3: Cross multiply
    20.25x = 27.81 × 18.41
  4. Step 4: Simplify right side
    20.25x = 511.84
  5. Step 5: Solve for x
    x = 511.84/20.25
  6. Step 6: Final answer
    x = 25.28

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.