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Finding the Third Proportional to 78,906 and 122,415

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Solution

The third proportional to 78,906 and 122,415 is: 189,914.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,906 : 122,415 = 122,415 : x
  2. Step 2: Convert to fraction form
    78,906/122,415 = 122,415/x
  3. Step 3: Cross multiply
    78,906x = 122,415 × 122,415
  4. Step 4: Simplify right side
    78,906x = 14,985,432,225
  5. Step 5: Solve for x
    x = 14,985,432,225/78,906
  6. Step 6: Final answer
    x = 189,914.99

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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.