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Finding the Fourth Proportional to 413.38, 620.26 and 221

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Solution

The fourth proportional to 413.38, 620.26 and 221 is: 331.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    413.38 : 620.26 = 221 : x
  2. Step 2: Convert to fraction form
    413.38/620.26 = 221/x
  3. Step 3: Cross multiply
    413.38x = 620.26 × 221
  4. Step 4: Simplify right side
    413.38x = 137,077.46
  5. Step 5: Solve for x
    x = 137,077.46/413.38
  6. Step 6: Final answer
    x = 331.60

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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.