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Finding the Third Proportional to 31,397 and 68,991

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Solution

The third proportional to 31,397 and 68,991 is: 151,599.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,397 : 68,991 = 68,991 : x
  2. Step 2: Convert to fraction form
    31,397/68,991 = 68,991/x
  3. Step 3: Cross multiply
    31,397x = 68,991 × 68,991
  4. Step 4: Simplify right side
    31,397x = 4,759,758,081
  5. Step 5: Solve for x
    x = 4,759,758,081/31,397
  6. Step 6: Final answer
    x = 151,599.14

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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.