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Finding the Third Proportional to 78,908 and 122,418

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Solution

The third proportional to 78,908 and 122,418 is: 189,919.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,908 : 122,418 = 122,418 : x
  2. Step 2: Convert to fraction form
    78,908/122,418 = 122,418/x
  3. Step 3: Cross multiply
    78,908x = 122,418 × 122,418
  4. Step 4: Simplify right side
    78,908x = 14,986,166,724
  5. Step 5: Solve for x
    x = 14,986,166,724/78,908
  6. Step 6: Final answer
    x = 189,919.49

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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.