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Finding the Fourth Proportional to 80.39, 120.69 and 50.02

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Solution

The fourth proportional to 80.39, 120.69 and 50.02 is: 75.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    80.39 : 120.69 = 50.02 : x
  2. Step 2: Convert to fraction form
    80.39/120.69 = 50.02/x
  3. Step 3: Cross multiply
    80.39x = 120.69 × 50.02
  4. Step 4: Simplify right side
    80.39x = 6,036.61
  5. Step 5: Solve for x
    x = 6,036.61/80.39
  6. Step 6: Final answer
    x = 75.09

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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.