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Finding the Fourth Proportional to 12.03, 18.20 and 11.85

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Solution

The fourth proportional to 12.03, 18.20 and 11.85 is: 17.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    12.03 : 18.20 = 11.85 : x
  2. Step 2: Convert to fraction form
    12.03/18.20 = 11.85/x
  3. Step 3: Cross multiply
    12.03x = 18.20 × 11.85
  4. Step 4: Simplify right side
    12.03x = 215.61
  5. Step 5: Solve for x
    x = 215.61/12.03
  6. Step 6: Final answer
    x = 17.92

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.