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Finding the Third Proportional to 2,940 and 7,728

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Solution

The third proportional to 2,940 and 7,728 is: 20,313.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,940 : 7,728 = 7,728 : x
  2. Step 2: Convert to fraction form
    2,940/7,728 = 7,728/x
  3. Step 3: Cross multiply
    2,940x = 7,728 × 7,728
  4. Step 4: Simplify right side
    2,940x = 59,721,984
  5. Step 5: Solve for x
    x = 59,721,984/2,940
  6. Step 6: Final answer
    x = 20,313.60

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Why These Related Problems?

These problems maintain the same ratio (2.63) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.