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Finding the Fourth Proportional to 728.52, 1,005.34 and 396.94

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Solution

The fourth proportional to 728.52, 1,005.34 and 396.94 is: 547.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    728.52 : 1,005.34 = 396.94 : x
  2. Step 2: Convert to fraction form
    728.52/1,005.34 = 396.94/x
  3. Step 3: Cross multiply
    728.52x = 1,005.34 × 396.94
  4. Step 4: Simplify right side
    728.52x = 399,057.67
  5. Step 5: Solve for x
    x = 399,057.67/728.52
  6. Step 6: Final answer
    x = 547.76

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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.