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Finding the Third Proportional to 31,218 and 68,268

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Solution

The third proportional to 31,218 and 68,268 is: 149,289.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,218 : 68,268 = 68,268 : x
  2. Step 2: Convert to fraction form
    31,218/68,268 = 68,268/x
  3. Step 3: Cross multiply
    31,218x = 68,268 × 68,268
  4. Step 4: Simplify right side
    31,218x = 4,660,519,824
  5. Step 5: Solve for x
    x = 4,660,519,824/31,218
  6. Step 6: Final answer
    x = 149,289.51

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Why These Related Problems?

These problems maintain the same ratio (2.19) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.