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Finding the Fourth Proportional to 83.49, 115.11 and 66.09

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Solution

The fourth proportional to 83.49, 115.11 and 66.09 is: 91.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    83.49 : 115.11 = 66.09 : x
  2. Step 2: Convert to fraction form
    83.49/115.11 = 66.09/x
  3. Step 3: Cross multiply
    83.49x = 115.11 × 66.09
  4. Step 4: Simplify right side
    83.49x = 7,607.62
  5. Step 5: Solve for x
    x = 7,607.62/83.49
  6. Step 6: Final answer
    x = 91.12

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.