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Finding the Third Proportional to 4,212 and 7,872

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Solution

The third proportional to 4,212 and 7,872 is: 14,712.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,212 : 7,872 = 7,872 : x
  2. Step 2: Convert to fraction form
    4,212/7,872 = 7,872/x
  3. Step 3: Cross multiply
    4,212x = 7,872 × 7,872
  4. Step 4: Simplify right side
    4,212x = 61,968,384
  5. Step 5: Solve for x
    x = 61,968,384/4,212
  6. Step 6: Final answer
    x = 14,712.34

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Why These Related Problems?

These problems maintain the same ratio (1.87) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.