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Finding the Fourth Proportional to 725.84, 1,001.67 and 394.28

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Solution

The fourth proportional to 725.84, 1,001.67 and 394.28 is: 544.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    725.84 : 1,001.67 = 394.28 : x
  2. Step 2: Convert to fraction form
    725.84/1,001.67 = 394.28/x
  3. Step 3: Cross multiply
    725.84x = 1,001.67 × 394.28
  4. Step 4: Simplify right side
    725.84x = 394,940.95
  5. Step 5: Solve for x
    x = 394,940.95/725.84
  6. Step 6: Final answer
    x = 544.12

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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.