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Finding the Fourth Proportional to 413.89, 620.76 and 170.42

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Solution

The fourth proportional to 413.89, 620.76 and 170.42 is: 255.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    413.89 : 620.76 = 170.42 : x
  2. Step 2: Convert to fraction form
    413.89/620.76 = 170.42/x
  3. Step 3: Cross multiply
    413.89x = 620.76 × 170.42
  4. Step 4: Simplify right side
    413.89x = 105,787.45
  5. Step 5: Solve for x
    x = 105,787.45/413.89
  6. Step 6: Final answer
    x = 255.59

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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.