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Finding the Fourth Proportional to 728.11, 1,004.80 and 396.53

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Solution

The fourth proportional to 728.11, 1,004.80 and 396.53 is: 547.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    728.11 : 1,004.80 = 396.53 : x
  2. Step 2: Convert to fraction form
    728.11/1,004.80 = 396.53/x
  3. Step 3: Cross multiply
    728.11x = 1,004.80 × 396.53
  4. Step 4: Simplify right side
    728.11x = 398,435.78
  5. Step 5: Solve for x
    x = 398,435.78/728.11
  6. Step 6: Final answer
    x = 547.22

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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.