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Finding the Third Proportional to 99,215 and 213,981

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Solution

The third proportional to 99,215 and 213,981 is: 461,501.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,215 : 213,981 = 213,981 : x
  2. Step 2: Convert to fraction form
    99,215/213,981 = 213,981/x
  3. Step 3: Cross multiply
    99,215x = 213,981 × 213,981
  4. Step 4: Simplify right side
    99,215x = 45,787,868,361
  5. Step 5: Solve for x
    x = 45,787,868,361/99,215
  6. Step 6: Final answer
    x = 461,501.47

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Why These Related Problems?

These problems maintain the same ratio (2.16) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.