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Finding the Fourth Proportional to 413.45, 620.20 and 169.81

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Solution

The fourth proportional to 413.45, 620.20 and 169.81 is: 254.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    413.45 : 620.20 = 169.81 : x
  2. Step 2: Convert to fraction form
    413.45/620.20 = 169.81/x
  3. Step 3: Cross multiply
    413.45x = 620.20 × 169.81
  4. Step 4: Simplify right side
    413.45x = 105,313.87
  5. Step 5: Solve for x
    x = 105,313.87/413.45
  6. Step 6: Final answer
    x = 254.72

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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.