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Finding the Fourth Proportional to 727.97, 1,004.62 and 396.40

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Solution

The fourth proportional to 727.97, 1,004.62 and 396.40 is: 547.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    727.97 : 1,004.62 = 396.40 : x
  2. Step 2: Convert to fraction form
    727.97/1,004.62 = 396.40/x
  3. Step 3: Cross multiply
    727.97x = 1,004.62 × 396.40
  4. Step 4: Simplify right side
    727.97x = 398,227.87
  5. Step 5: Solve for x
    x = 398,227.87/727.97
  6. Step 6: Final answer
    x = 547.04

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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.