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Finding the Fourth Proportional to 119.39, 178.88 and 86.73

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Solution

The fourth proportional to 119.39, 178.88 and 86.73 is: 129.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    119.39 : 178.88 = 86.73 : x
  2. Step 2: Convert to fraction form
    119.39/178.88 = 86.73/x
  3. Step 3: Cross multiply
    119.39x = 178.88 × 86.73
  4. Step 4: Simplify right side
    119.39x = 15,514.26
  5. Step 5: Solve for x
    x = 15,514.26/119.39
  6. Step 6: Final answer
    x = 129.95

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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.