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Finding the Fourth Proportional to 413.78, 620.69 and 170.14

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Solution

The fourth proportional to 413.78, 620.69 and 170.14 is: 255.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    413.78 : 620.69 = 170.14 : x
  2. Step 2: Convert to fraction form
    413.78/620.69 = 170.14/x
  3. Step 3: Cross multiply
    413.78x = 620.69 × 170.14
  4. Step 4: Simplify right side
    413.78x = 105,601.79
  5. Step 5: Solve for x
    x = 105,601.79/413.78
  6. Step 6: Final answer
    x = 255.21

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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.