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Finding the Fourth Proportional to 61.31, 91.96 and 20.73

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Solution

The fourth proportional to 61.31, 91.96 and 20.73 is: 31.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    61.31 : 91.96 = 20.73 : x
  2. Step 2: Convert to fraction form
    61.31/91.96 = 20.73/x
  3. Step 3: Cross multiply
    61.31x = 91.96 × 20.73
  4. Step 4: Simplify right side
    61.31x = 1,906.42
  5. Step 5: Solve for x
    x = 1,906.42/61.31
  6. Step 6: Final answer
    x = 31.10

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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.