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Finding the Fourth Proportional to 413.21, 620.67 and 399.38

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Solution

The fourth proportional to 413.21, 620.67 and 399.38 is: 599.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    413.21 : 620.67 = 399.38 : x
  2. Step 2: Convert to fraction form
    413.21/620.67 = 399.38/x
  3. Step 3: Cross multiply
    413.21x = 620.67 × 399.38
  4. Step 4: Simplify right side
    413.21x = 247,881.58
  5. Step 5: Solve for x
    x = 247,881.58/413.21
  6. Step 6: Final answer
    x = 599.89

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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.