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Finding the Third Proportional to 77,378 and 122,979

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Solution

The third proportional to 77,378 and 122,979 is: 195,453.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    77,378 : 122,979 = 122,979 : x
  2. Step 2: Convert to fraction form
    77,378/122,979 = 122,979/x
  3. Step 3: Cross multiply
    77,378x = 122,979 × 122,979
  4. Step 4: Simplify right side
    77,378x = 15,123,834,441
  5. Step 5: Solve for x
    x = 15,123,834,441/77,378
  6. Step 6: Final answer
    x = 195,453.93

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Why These Related Problems?

These problems maintain the same ratio (1.59) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.