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Finding the Fourth Proportional to 729.09, 1,006.16 and 397.52

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Solution

The fourth proportional to 729.09, 1,006.16 and 397.52 is: 548.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    729.09 : 1,006.16 = 397.52 : x
  2. Step 2: Convert to fraction form
    729.09/1,006.16 = 397.52/x
  3. Step 3: Cross multiply
    729.09x = 1,006.16 × 397.52
  4. Step 4: Simplify right side
    729.09x = 399,961.70
  5. Step 5: Solve for x
    x = 399,961.70/729.09
  6. Step 6: Final answer
    x = 548.58

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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.