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Finding the Fourth Proportional to 84.11, 125.94 and 70.61

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Solution

The fourth proportional to 84.11, 125.94 and 70.61 is: 105.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.11 : 125.94 = 70.61 : x
  2. Step 2: Convert to fraction form
    84.11/125.94 = 70.61/x
  3. Step 3: Cross multiply
    84.11x = 125.94 × 70.61
  4. Step 4: Simplify right side
    84.11x = 8,892.62
  5. Step 5: Solve for x
    x = 8,892.62/84.11
  6. Step 6: Final answer
    x = 105.73

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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.