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Finding the Fourth Proportional to 727.01, 1,003.28 and 395.43

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Solution

The fourth proportional to 727.01, 1,003.28 and 395.43 is: 545.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    727.01 : 1,003.28 = 395.43 : x
  2. Step 2: Convert to fraction form
    727.01/1,003.28 = 395.43/x
  3. Step 3: Cross multiply
    727.01x = 1,003.28 × 395.43
  4. Step 4: Simplify right side
    727.01x = 396,725.03
  5. Step 5: Solve for x
    x = 396,725.03/727.01
  6. Step 6: Final answer
    x = 545.70

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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.