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Finding the Third Proportional to 31,408 and 68,216

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Solution

The third proportional to 31,408 and 68,216 is: 148,160.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,408 : 68,216 = 68,216 : x
  2. Step 2: Convert to fraction form
    31,408/68,216 = 68,216/x
  3. Step 3: Cross multiply
    31,408x = 68,216 × 68,216
  4. Step 4: Simplify right side
    31,408x = 4,653,422,656
  5. Step 5: Solve for x
    x = 4,653,422,656/31,408
  6. Step 6: Final answer
    x = 148,160.43

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Why These Related Problems?

These problems maintain the same ratio (2.17) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.