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Finding the Fourth Proportional to 205.44, 308.24 and 77.20

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Solution

The fourth proportional to 205.44, 308.24 and 77.20 is: 115.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    205.44 : 308.24 = 77.20 : x
  2. Step 2: Convert to fraction form
    205.44/308.24 = 77.20/x
  3. Step 3: Cross multiply
    205.44x = 308.24 × 77.20
  4. Step 4: Simplify right side
    205.44x = 23,796.13
  5. Step 5: Solve for x
    x = 23,796.13/205.44
  6. Step 6: Final answer
    x = 115.83

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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.