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Finding the Fourth Proportional to 119.35, 178.62 and 105.85

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Solution

The fourth proportional to 119.35, 178.62 and 105.85 is: 158.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    119.35 : 178.62 = 105.85 : x
  2. Step 2: Convert to fraction form
    119.35/178.62 = 105.85/x
  3. Step 3: Cross multiply
    119.35x = 178.62 × 105.85
  4. Step 4: Simplify right side
    119.35x = 18,906.93
  5. Step 5: Solve for x
    x = 18,906.93/119.35
  6. Step 6: Final answer
    x = 158.42

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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.