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Finding the Fourth Proportional to 739.87, 1,020.99 and 408.29

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Solution

The fourth proportional to 739.87, 1,020.99 and 408.29 is: 563.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    739.87 : 1,020.99 = 408.29 : x
  2. Step 2: Convert to fraction form
    739.87/1,020.99 = 408.29/x
  3. Step 3: Cross multiply
    739.87x = 1,020.99 × 408.29
  4. Step 4: Simplify right side
    739.87x = 416,859.88
  5. Step 5: Solve for x
    x = 416,859.88/739.87
  6. Step 6: Final answer
    x = 563.42

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.