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Finding the Third Proportional to 50,128 and 77,720

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Solution

The third proportional to 50,128 and 77,720 is: 120,499.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    50,128 : 77,720 = 77,720 : x
  2. Step 2: Convert to fraction form
    50,128/77,720 = 77,720/x
  3. Step 3: Cross multiply
    50,128x = 77,720 × 77,720
  4. Step 4: Simplify right side
    50,128x = 6,040,398,400
  5. Step 5: Solve for x
    x = 6,040,398,400/50,128
  6. Step 6: Final answer
    x = 120,499.49

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Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.