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Finding the Fourth Proportional to 205.52, 308.31 and 61.22

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Solution

The fourth proportional to 205.52, 308.31 and 61.22 is: 91.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    205.52 : 308.31 = 61.22 : x
  2. Step 2: Convert to fraction form
    205.52/308.31 = 61.22/x
  3. Step 3: Cross multiply
    205.52x = 308.31 × 61.22
  4. Step 4: Simplify right side
    205.52x = 18,873.20
  5. Step 5: Solve for x
    x = 18,873.20/205.52
  6. Step 6: Final answer
    x = 91.83

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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.