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Finding the Third Proportional to 17 and 39.31

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Solution

The third proportional to 17 and 39.31 is: 90.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    17 : 39.31 = 39.31 : x
  2. Step 2: Convert to fraction form
    17/39.31 = 39.31/x
  3. Step 3: Cross multiply
    17x = 39.31 × 39.31
  4. Step 4: Simplify right side
    17x = 1,545.47
  5. Step 5: Solve for x
    x = 1,545.47/17
  6. Step 6: Final answer
    x = 90.91

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Why These Related Problems?

These problems maintain the same ratio (2.31) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.