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Finding the Fourth Proportional to 725.42, 1,001.09 and 393.85

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Solution

The fourth proportional to 725.42, 1,001.09 and 393.85 is: 543.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    725.42 : 1,001.09 = 393.85 : x
  2. Step 2: Convert to fraction form
    725.42/1,001.09 = 393.85/x
  3. Step 3: Cross multiply
    725.42x = 1,001.09 × 393.85
  4. Step 4: Simplify right side
    725.42x = 394,279.87
  5. Step 5: Solve for x
    x = 394,279.87/725.42
  6. Step 6: Final answer
    x = 543.52

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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.