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Finding the Fourth Proportional to 118.87, 178.38 and 80.39

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Solution

The fourth proportional to 118.87, 178.38 and 80.39 is: 120.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    118.87 : 178.38 = 80.39 : x
  2. Step 2: Convert to fraction form
    118.87/178.38 = 80.39/x
  3. Step 3: Cross multiply
    118.87x = 178.38 × 80.39
  4. Step 4: Simplify right side
    118.87x = 14,340.41
  5. Step 5: Solve for x
    x = 14,340.41/118.87
  6. Step 6: Final answer
    x = 120.64

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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.