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Finding the Third Proportional to 84,408.75 and 128,757

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Solution

The third proportional to 84,408.75 and 128,757 is: 196,405.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,408.75 : 128,757 = 128,757 : x
  2. Step 2: Convert to fraction form
    84,408.75/128,757 = 128,757/x
  3. Step 3: Cross multiply
    84,408.75x = 128,757 × 128,757
  4. Step 4: Simplify right side
    84,408.75x = 16,578,365,049
  5. Step 5: Solve for x
    x = 16,578,365,049/84,408.75
  6. Step 6: Final answer
    x = 196,405.76

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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.