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Finding the Fourth Proportional to 12.09, 16.75 and 11.89

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Solution

The fourth proportional to 12.09, 16.75 and 11.89 is: 16.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    12.09 : 16.75 = 11.89 : x
  2. Step 2: Convert to fraction form
    12.09/16.75 = 11.89/x
  3. Step 3: Cross multiply
    12.09x = 16.75 × 11.89
  4. Step 4: Simplify right side
    12.09x = 199.16
  5. Step 5: Solve for x
    x = 199.16/12.09
  6. Step 6: Final answer
    x = 16.47

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.