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Finding the Fourth Proportional to 725.47, 1,001.15 and 393.90

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Solution

The fourth proportional to 725.47, 1,001.15 and 393.90 is: 543.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    725.47 : 1,001.15 = 393.90 : x
  2. Step 2: Convert to fraction form
    725.47/1,001.15 = 393.90/x
  3. Step 3: Cross multiply
    725.47x = 1,001.15 × 393.90
  4. Step 4: Simplify right side
    725.47x = 394,352.99
  5. Step 5: Solve for x
    x = 394,352.99/725.47
  6. Step 6: Final answer
    x = 543.58

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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.