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Finding the Fourth Proportional to 727.38, 1,003.78 and 395.80

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Solution

The fourth proportional to 727.38, 1,003.78 and 395.80 is: 546.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    727.38 : 1,003.78 = 395.80 : x
  2. Step 2: Convert to fraction form
    727.38/1,003.78 = 395.80/x
  3. Step 3: Cross multiply
    727.38x = 1,003.78 × 395.80
  4. Step 4: Simplify right side
    727.38x = 397,298.64
  5. Step 5: Solve for x
    x = 397,298.64/727.38
  6. Step 6: Final answer
    x = 546.20

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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.