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Finding the Third Proportional to 2,904 and 7,881

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Solution

The third proportional to 2,904 and 7,881 is: 21,387.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,904 : 7,881 = 7,881 : x
  2. Step 2: Convert to fraction form
    2,904/7,881 = 7,881/x
  3. Step 3: Cross multiply
    2,904x = 7,881 × 7,881
  4. Step 4: Simplify right side
    2,904x = 62,110,161
  5. Step 5: Solve for x
    x = 62,110,161/2,904
  6. Step 6: Final answer
    x = 21,387.80

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Why These Related Problems?

These problems maintain the same ratio (2.71) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.