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Finding the Fourth Proportional to 18.54, 27.81 and 8.39

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Solution

The fourth proportional to 18.54, 27.81 and 8.39 is: 12.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    18.54 : 27.81 = 8.39 : x
  2. Step 2: Convert to fraction form
    18.54/27.81 = 8.39/x
  3. Step 3: Cross multiply
    18.54x = 27.81 × 8.39
  4. Step 4: Simplify right side
    18.54x = 233.19
  5. Step 5: Solve for x
    x = 233.19/18.54
  6. Step 6: Final answer
    x = 12.58

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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.