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Finding the Third Proportional to 99,420 and 217,740

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Solution

The third proportional to 99,420 and 217,740 is: 476,872.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,420 : 217,740 = 217,740 : x
  2. Step 2: Convert to fraction form
    99,420/217,740 = 217,740/x
  3. Step 3: Cross multiply
    99,420x = 217,740 × 217,740
  4. Step 4: Simplify right side
    99,420x = 47,410,707,600
  5. Step 5: Solve for x
    x = 47,410,707,600/99,420
  6. Step 6: Final answer
    x = 476,872.94

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Why These Related Problems?

These problems maintain the same ratio (2.19) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.