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Finding the Third Proportional to 51,115 and 78,293

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Solution

The third proportional to 51,115 and 78,293 is: 119,921.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    51,115 : 78,293 = 78,293 : x
  2. Step 2: Convert to fraction form
    51,115/78,293 = 78,293/x
  3. Step 3: Cross multiply
    51,115x = 78,293 × 78,293
  4. Step 4: Simplify right side
    51,115x = 6,129,793,849
  5. Step 5: Solve for x
    x = 6,129,793,849/51,115
  6. Step 6: Final answer
    x = 119,921.62

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Why These Related Problems?

These problems maintain the same ratio (1.53) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.