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Finding the Third Proportional to 121,808 and 219,315

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Solution

The third proportional to 121,808 and 219,315 is: 394,876.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,808 : 219,315 = 219,315 : x
  2. Step 2: Convert to fraction form
    121,808/219,315 = 219,315/x
  3. Step 3: Cross multiply
    121,808x = 219,315 × 219,315
  4. Step 4: Simplify right side
    121,808x = 48,099,069,225
  5. Step 5: Solve for x
    x = 48,099,069,225/121,808
  6. Step 6: Final answer
    x = 394,876.11

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Why These Related Problems?

These problems maintain the same ratio (1.80) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.