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Finding the Fourth Proportional to 120.60, 180.79 and 80.03

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Solution

The fourth proportional to 120.60, 180.79 and 80.03 is: 119.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    120.60 : 180.79 = 80.03 : x
  2. Step 2: Convert to fraction form
    120.60/180.79 = 80.03/x
  3. Step 3: Cross multiply
    120.60x = 180.79 × 80.03
  4. Step 4: Simplify right side
    120.60x = 14,468.62
  5. Step 5: Solve for x
    x = 14,468.62/120.60
  6. Step 6: Final answer
    x = 119.97

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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.