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Finding the Fourth Proportional to 729.38, 1,006.55 and 397.80

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Solution

The fourth proportional to 729.38, 1,006.55 and 397.80 is: 548.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    729.38 : 1,006.55 = 397.80 : x
  2. Step 2: Convert to fraction form
    729.38/1,006.55 = 397.80/x
  3. Step 3: Cross multiply
    729.38x = 1,006.55 × 397.80
  4. Step 4: Simplify right side
    729.38x = 400,405.09
  5. Step 5: Solve for x
    x = 400,405.09/729.38
  6. Step 6: Final answer
    x = 548.97

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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.