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Finding the Fourth Proportional to 12.06, 18.09 and 3.94

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Solution

The fourth proportional to 12.06, 18.09 and 3.94 is: 5.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    12.06 : 18.09 = 3.94 : x
  2. Step 2: Convert to fraction form
    12.06/18.09 = 3.94/x
  3. Step 3: Cross multiply
    12.06x = 18.09 × 3.94
  4. Step 4: Simplify right side
    12.06x = 71.18
  5. Step 5: Solve for x
    x = 71.18/12.06
  6. Step 6: Final answer
    x = 5.90

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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.