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Finding the Third Proportional to 2,938 and 7,681

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Solution

The third proportional to 2,938 and 7,681 is: 20,080.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,938 : 7,681 = 7,681 : x
  2. Step 2: Convert to fraction form
    2,938/7,681 = 7,681/x
  3. Step 3: Cross multiply
    2,938x = 7,681 × 7,681
  4. Step 4: Simplify right side
    2,938x = 58,997,761
  5. Step 5: Solve for x
    x = 58,997,761/2,938
  6. Step 6: Final answer
    x = 20,080.93

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Why These Related Problems?

These problems maintain the same ratio (2.61) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.