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Finding the Third Proportional to 3,640 and 7,928

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Solution

The third proportional to 3,640 and 7,928 is: 17,267.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,640 : 7,928 = 7,928 : x
  2. Step 2: Convert to fraction form
    3,640/7,928 = 7,928/x
  3. Step 3: Cross multiply
    3,640x = 7,928 × 7,928
  4. Step 4: Simplify right side
    3,640x = 62,853,184
  5. Step 5: Solve for x
    x = 62,853,184/3,640
  6. Step 6: Final answer
    x = 17,267.36

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Why These Related Problems?

These problems maintain the same ratio (2.18) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.