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Finding the Fourth Proportional to 727.76, 1,004.31 and 396.18

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Solution

The fourth proportional to 727.76, 1,004.31 and 396.18 is: 546.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    727.76 : 1,004.31 = 396.18 : x
  2. Step 2: Convert to fraction form
    727.76/1,004.31 = 396.18/x
  3. Step 3: Cross multiply
    727.76x = 1,004.31 × 396.18
  4. Step 4: Simplify right side
    727.76x = 397,887.54
  5. Step 5: Solve for x
    x = 397,887.54/727.76
  6. Step 6: Final answer
    x = 546.73

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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.