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Finding the Fourth Proportional to 413.28, 620.25 and 218.49

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Solution

The fourth proportional to 413.28, 620.25 and 218.49 is: 327.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    413.28 : 620.25 = 218.49 : x
  2. Step 2: Convert to fraction form
    413.28/620.25 = 218.49/x
  3. Step 3: Cross multiply
    413.28x = 620.25 × 218.49
  4. Step 4: Simplify right side
    413.28x = 135,518.42
  5. Step 5: Solve for x
    x = 135,518.42/413.28
  6. Step 6: Final answer
    x = 327.91

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.