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Finding the Fourth Proportional to 413.54, 620.40 and 197

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Solution

The fourth proportional to 413.54, 620.40 and 197 is: 295.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    413.54 : 620.40 = 197 : x
  2. Step 2: Convert to fraction form
    413.54/620.40 = 197/x
  3. Step 3: Cross multiply
    413.54x = 620.40 × 197
  4. Step 4: Simplify right side
    413.54x = 122,218.80
  5. Step 5: Solve for x
    x = 122,218.80/413.54
  6. Step 6: Final answer
    x = 295.54

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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.