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Finding the Third Proportional to 10,455.75 and 21,421

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Solution

The third proportional to 10,455.75 and 21,421 is: 43,885.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,455.75 : 21,421 = 21,421 : x
  2. Step 2: Convert to fraction form
    10,455.75/21,421 = 21,421/x
  3. Step 3: Cross multiply
    10,455.75x = 21,421 × 21,421
  4. Step 4: Simplify right side
    10,455.75x = 458,859,241
  5. Step 5: Solve for x
    x = 458,859,241/10,455.75
  6. Step 6: Final answer
    x = 43,885.83

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Why These Related Problems?

These problems maintain the same ratio (2.05) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.