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Finding the Fourth Proportional to 413.20, 620 and 169.72

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Solution

The fourth proportional to 413.20, 620 and 169.72 is: 254.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    413.20 : 620 = 169.72 : x
  2. Step 2: Convert to fraction form
    413.20/620 = 169.72/x
  3. Step 3: Cross multiply
    413.20x = 620 × 169.72
  4. Step 4: Simplify right side
    413.20x = 105,226.40
  5. Step 5: Solve for x
    x = 105,226.40/413.20
  6. Step 6: Final answer
    x = 254.66

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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.