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Finding the Third Proportional to 56,389 and 81,919

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Solution

The third proportional to 56,389 and 81,919 is: 119,007.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    56,389 : 81,919 = 81,919 : x
  2. Step 2: Convert to fraction form
    56,389/81,919 = 81,919/x
  3. Step 3: Cross multiply
    56,389x = 81,919 × 81,919
  4. Step 4: Simplify right side
    56,389x = 6,710,722,561
  5. Step 5: Solve for x
    x = 6,710,722,561/56,389
  6. Step 6: Final answer
    x = 119,007.65

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Why These Related Problems?

These problems maintain the same ratio (1.45) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.