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Finding the Third Proportional to 31,205 and 68,647

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Solution

The third proportional to 31,205 and 68,647 is: 151,014.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,205 : 68,647 = 68,647 : x
  2. Step 2: Convert to fraction form
    31,205/68,647 = 68,647/x
  3. Step 3: Cross multiply
    31,205x = 68,647 × 68,647
  4. Step 4: Simplify right side
    31,205x = 4,712,410,609
  5. Step 5: Solve for x
    x = 4,712,410,609/31,205
  6. Step 6: Final answer
    x = 151,014.60

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Why These Related Problems?

These problems maintain the same ratio (2.20) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.