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Finding the Fourth Proportional to 739.90, 1,021.11 and 408.37

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Solution

The fourth proportional to 739.90, 1,021.11 and 408.37 is: 563.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    739.90 : 1,021.11 = 408.37 : x
  2. Step 2: Convert to fraction form
    739.90/1,021.11 = 408.37/x
  3. Step 3: Cross multiply
    739.90x = 1,021.11 × 408.37
  4. Step 4: Simplify right side
    739.90x = 416,990.69
  5. Step 5: Solve for x
    x = 416,990.69/739.90
  6. Step 6: Final answer
    x = 563.58

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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.