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Finding the Third Proportional to 51,156 and 78,921

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Solution

The third proportional to 51,156 and 78,921 is: 121,755.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    51,156 : 78,921 = 78,921 : x
  2. Step 2: Convert to fraction form
    51,156/78,921 = 78,921/x
  3. Step 3: Cross multiply
    51,156x = 78,921 × 78,921
  4. Step 4: Simplify right side
    51,156x = 6,228,524,241
  5. Step 5: Solve for x
    x = 6,228,524,241/51,156
  6. Step 6: Final answer
    x = 121,755.50

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Why These Related Problems?

These problems maintain the same ratio (1.54) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.