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Finding the Fourth Proportional to 203.62, 305.42 and 80.20

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Solution

The fourth proportional to 203.62, 305.42 and 80.20 is: 120.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    203.62 : 305.42 = 80.20 : x
  2. Step 2: Convert to fraction form
    203.62/305.42 = 80.20/x
  3. Step 3: Cross multiply
    203.62x = 305.42 × 80.20
  4. Step 4: Simplify right side
    203.62x = 24,494.68
  5. Step 5: Solve for x
    x = 24,494.68/203.62
  6. Step 6: Final answer
    x = 120.30

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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.