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Finding the Third Proportional to 78,869 and 122,322

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Solution

The third proportional to 78,869 and 122,322 is: 189,715.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,869 : 122,322 = 122,322 : x
  2. Step 2: Convert to fraction form
    78,869/122,322 = 122,322/x
  3. Step 3: Cross multiply
    78,869x = 122,322 × 122,322
  4. Step 4: Simplify right side
    78,869x = 14,962,671,684
  5. Step 5: Solve for x
    x = 14,962,671,684/78,869
  6. Step 6: Final answer
    x = 189,715.50

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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.