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Finding the Third Proportional to 5 and 10.31

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Solution

The third proportional to 5 and 10.31 is: 21.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    5 : 10.31 = 10.31 : x
  2. Step 2: Convert to fraction form
    5/10.31 = 10.31/x
  3. Step 3: Cross multiply
    5x = 10.31 × 10.31
  4. Step 4: Simplify right side
    5x = 106.35
  5. Step 5: Solve for x
    x = 106.35/5
  6. Step 6: Final answer
    x = 21.27

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Why These Related Problems?

These problems maintain the same ratio (2.06) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.