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Finding the Fourth Proportional to 413.29, 620.04 and 139.39

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Solution

The fourth proportional to 413.29, 620.04 and 139.39 is: 209.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    413.29 : 620.04 = 139.39 : x
  2. Step 2: Convert to fraction form
    413.29/620.04 = 139.39/x
  3. Step 3: Cross multiply
    413.29x = 620.04 × 139.39
  4. Step 4: Simplify right side
    413.29x = 86,425.56
  5. Step 5: Solve for x
    x = 86,425.56/413.29
  6. Step 6: Final answer
    x = 209.12

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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.