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Finding the Third Proportional to 413.25 and 640.63

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Solution

The third proportional to 413.25 and 640.63 is: 993.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    413.25 : 640.63 = 640.63 : x
  2. Step 2: Convert to fraction form
    413.25/640.63 = 640.63/x
  3. Step 3: Cross multiply
    413.25x = 640.63 × 640.63
  4. Step 4: Simplify right side
    413.25x = 410,400.39
  5. Step 5: Solve for x
    x = 410,400.39/413.25
  6. Step 6: Final answer
    x = 993.10

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Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.