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Finding the Fourth Proportional to 18.20, 27.21 and 13.64

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Solution

The fourth proportional to 18.20, 27.21 and 13.64 is: 20.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    18.20 : 27.21 = 13.64 : x
  2. Step 2: Convert to fraction form
    18.20/27.21 = 13.64/x
  3. Step 3: Cross multiply
    18.20x = 27.21 × 13.64
  4. Step 4: Simplify right side
    18.20x = 371.08
  5. Step 5: Solve for x
    x = 371.08/18.20
  6. Step 6: Final answer
    x = 20.39

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.