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Finding the Third Proportional to 99,390 and 212,982

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Solution

The third proportional to 99,390 and 212,982 is: 456,397.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,390 : 212,982 = 212,982 : x
  2. Step 2: Convert to fraction form
    99,390/212,982 = 212,982/x
  3. Step 3: Cross multiply
    99,390x = 212,982 × 212,982
  4. Step 4: Simplify right side
    99,390x = 45,361,332,324
  5. Step 5: Solve for x
    x = 45,361,332,324/99,390
  6. Step 6: Final answer
    x = 456,397.35

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Why These Related Problems?

These problems maintain the same ratio (2.14) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.