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Finding the Fourth Proportional to 413.72, 620.47 and 121.22

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Solution

The fourth proportional to 413.72, 620.47 and 121.22 is: 181.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    413.72 : 620.47 = 121.22 : x
  2. Step 2: Convert to fraction form
    413.72/620.47 = 121.22/x
  3. Step 3: Cross multiply
    413.72x = 620.47 × 121.22
  4. Step 4: Simplify right side
    413.72x = 75,209.97
  5. Step 5: Solve for x
    x = 75,209.97/413.72
  6. Step 6: Final answer
    x = 181.79

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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.