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Finding the Third Proportional to 31,917 and 68,178

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Solution

The third proportional to 31,917 and 68,178 is: 145,635.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,917 : 68,178 = 68,178 : x
  2. Step 2: Convert to fraction form
    31,917/68,178 = 68,178/x
  3. Step 3: Cross multiply
    31,917x = 68,178 × 68,178
  4. Step 4: Simplify right side
    31,917x = 4,648,239,684
  5. Step 5: Solve for x
    x = 4,648,239,684/31,917
  6. Step 6: Final answer
    x = 145,635.23

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Why These Related Problems?

These problems maintain the same ratio (2.14) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.