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Finding the Fourth Proportional to 486.11, 728.15 and 413.31

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Solution

The fourth proportional to 486.11, 728.15 and 413.31 is: 619.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    486.11 : 728.15 = 413.31 : x
  2. Step 2: Convert to fraction form
    486.11/728.15 = 413.31/x
  3. Step 3: Cross multiply
    486.11x = 728.15 × 413.31
  4. Step 4: Simplify right side
    486.11x = 300,951.68
  5. Step 5: Solve for x
    x = 300,951.68/486.11
  6. Step 6: Final answer
    x = 619.10

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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.