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Finding the Fourth Proportional to 18.23, 27.31 and 12.21

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Solution

The fourth proportional to 18.23, 27.31 and 12.21 is: 18.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    18.23 : 27.31 = 12.21 : x
  2. Step 2: Convert to fraction form
    18.23/27.31 = 12.21/x
  3. Step 3: Cross multiply
    18.23x = 27.31 × 12.21
  4. Step 4: Simplify right side
    18.23x = 333.46
  5. Step 5: Solve for x
    x = 333.46/18.23
  6. Step 6: Final answer
    x = 18.29

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.