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Finding the Fourth Proportional to 727.39, 1,003.80 and 395.83

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Solution

The fourth proportional to 727.39, 1,003.80 and 395.83 is: 546.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    727.39 : 1,003.80 = 395.83 : x
  2. Step 2: Convert to fraction form
    727.39/1,003.80 = 395.83/x
  3. Step 3: Cross multiply
    727.39x = 1,003.80 × 395.83
  4. Step 4: Simplify right side
    727.39x = 397,334.15
  5. Step 5: Solve for x
    x = 397,334.15/727.39
  6. Step 6: Final answer
    x = 546.25

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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.