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Finding the Third Proportional to 411.61 and 921.09

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Solution

The third proportional to 411.61 and 921.09 is: 2,061.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    411.61 : 921.09 = 921.09 : x
  2. Step 2: Convert to fraction form
    411.61/921.09 = 921.09/x
  3. Step 3: Cross multiply
    411.61x = 921.09 × 921.09
  4. Step 4: Simplify right side
    411.61x = 848,413.70
  5. Step 5: Solve for x
    x = 848,413.70/411.61
  6. Step 6: Final answer
    x = 2,061.21

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Why These Related Problems?

These problems maintain the same ratio (2.24) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.