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Finding the Third Proportional to 85,403 and 128,378

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Solution

The third proportional to 85,403 and 128,378 is: 192,978.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,403 : 128,378 = 128,378 : x
  2. Step 2: Convert to fraction form
    85,403/128,378 = 128,378/x
  3. Step 3: Cross multiply
    85,403x = 128,378 × 128,378
  4. Step 4: Simplify right side
    85,403x = 16,480,910,884
  5. Step 5: Solve for x
    x = 16,480,910,884/85,403
  6. Step 6: Final answer
    x = 192,978.13

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.