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Finding the Fourth Proportional to 12.39, 18.59 and 3.83

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Solution

The fourth proportional to 12.39, 18.59 and 3.83 is: 5.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    12.39 : 18.59 = 3.83 : x
  2. Step 2: Convert to fraction form
    12.39/18.59 = 3.83/x
  3. Step 3: Cross multiply
    12.39x = 18.59 × 3.83
  4. Step 4: Simplify right side
    12.39x = 71.23
  5. Step 5: Solve for x
    x = 71.23/12.39
  6. Step 6: Final answer
    x = 5.75

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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.