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Finding the Third Proportional to 99,899 and 212,511

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Solution

The third proportional to 99,899 and 212,511 is: 452,065.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,899 : 212,511 = 212,511 : x
  2. Step 2: Convert to fraction form
    99,899/212,511 = 212,511/x
  3. Step 3: Cross multiply
    99,899x = 212,511 × 212,511
  4. Step 4: Simplify right side
    99,899x = 45,160,925,121
  5. Step 5: Solve for x
    x = 45,160,925,121/99,899
  6. Step 6: Final answer
    x = 452,065.84

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Why These Related Problems?

These problems maintain the same ratio (2.13) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.