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Finding the Fourth Proportional to 725.92, 1,001.78 and 394.36

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Solution

The fourth proportional to 725.92, 1,001.78 and 394.36 is: 544.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    725.92 : 1,001.78 = 394.36 : x
  2. Step 2: Convert to fraction form
    725.92/1,001.78 = 394.36/x
  3. Step 3: Cross multiply
    725.92x = 1,001.78 × 394.36
  4. Step 4: Simplify right side
    725.92x = 395,061.96
  5. Step 5: Solve for x
    x = 395,061.96/725.92
  6. Step 6: Final answer
    x = 544.23

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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.