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Finding the Fourth Proportional to 119.48, 178.76 and 80.78

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Solution

The fourth proportional to 119.48, 178.76 and 80.78 is: 120.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    119.48 : 178.76 = 80.78 : x
  2. Step 2: Convert to fraction form
    119.48/178.76 = 80.78/x
  3. Step 3: Cross multiply
    119.48x = 178.76 × 80.78
  4. Step 4: Simplify right side
    119.48x = 14,438.94
  5. Step 5: Solve for x
    x = 14,438.94/119.48
  6. Step 6: Final answer
    x = 120.85

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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.