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Finding the Fourth Proportional to 729.15, 1,006.23 and 397.56

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Solution

The fourth proportional to 729.15, 1,006.23 and 397.56 is: 548.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    729.15 : 1,006.23 = 397.56 : x
  2. Step 2: Convert to fraction form
    729.15/1,006.23 = 397.56/x
  3. Step 3: Cross multiply
    729.15x = 1,006.23 × 397.56
  4. Step 4: Simplify right side
    729.15x = 400,036.80
  5. Step 5: Solve for x
    x = 400,036.80/729.15
  6. Step 6: Final answer
    x = 548.63

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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.