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Finding the Third Proportional to 9.31 and 20.31

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Solution

The third proportional to 9.31 and 20.31 is: 44.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    9.31 : 20.31 = 20.31 : x
  2. Step 2: Convert to fraction form
    9.31/20.31 = 20.31/x
  3. Step 3: Cross multiply
    9.31x = 20.31 × 20.31
  4. Step 4: Simplify right side
    9.31x = 412.60
  5. Step 5: Solve for x
    x = 412.60/9.31
  6. Step 6: Final answer
    x = 44.31

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Why These Related Problems?

These problems maintain the same ratio (2.18) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.