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Finding the Third Proportional to 138,438 and 216,879

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Solution

The third proportional to 138,438 and 216,879 is: 339,765.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,438 : 216,879 = 216,879 : x
  2. Step 2: Convert to fraction form
    138,438/216,879 = 216,879/x
  3. Step 3: Cross multiply
    138,438x = 216,879 × 216,879
  4. Step 4: Simplify right side
    138,438x = 47,036,500,641
  5. Step 5: Solve for x
    x = 47,036,500,641/138,438
  6. Step 6: Final answer
    x = 339,765.82

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Why These Related Problems?

These problems maintain the same ratio (1.57) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.