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Finding the Third Proportional to 4,728 and 7,872

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Solution

The third proportional to 4,728 and 7,872 is: 13,106.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,728 : 7,872 = 7,872 : x
  2. Step 2: Convert to fraction form
    4,728/7,872 = 7,872/x
  3. Step 3: Cross multiply
    4,728x = 7,872 × 7,872
  4. Step 4: Simplify right side
    4,728x = 61,968,384
  5. Step 5: Solve for x
    x = 61,968,384/4,728
  6. Step 6: Final answer
    x = 13,106.68

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Why These Related Problems?

These problems maintain the same ratio (1.66) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.