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Finding the Third Proportional to 8.72 and 16.31

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Solution

The third proportional to 8.72 and 16.31 is: 30.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    8.72 : 16.31 = 16.31 : x
  2. Step 2: Convert to fraction form
    8.72/16.31 = 16.31/x
  3. Step 3: Cross multiply
    8.72x = 16.31 × 16.31
  4. Step 4: Simplify right side
    8.72x = 266.10
  5. Step 5: Solve for x
    x = 266.10/8.72
  6. Step 6: Final answer
    x = 30.52

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Why These Related Problems?

These problems maintain the same ratio (1.87) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.