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Finding the Fourth Proportional to 119.31, 178.80 and 80.73

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Solution

The fourth proportional to 119.31, 178.80 and 80.73 is: 120.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    119.31 : 178.80 = 80.73 : x
  2. Step 2: Convert to fraction form
    119.31/178.80 = 80.73/x
  3. Step 3: Cross multiply
    119.31x = 178.80 × 80.73
  4. Step 4: Simplify right side
    119.31x = 14,434.52
  5. Step 5: Solve for x
    x = 14,434.52/119.31
  6. Step 6: Final answer
    x = 120.98

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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.