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Finding the Fourth Proportional to 729.20, 1,006.32 and 397.65

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Solution

The fourth proportional to 729.20, 1,006.32 and 397.65 is: 548.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    729.20 : 1,006.32 = 397.65 : x
  2. Step 2: Convert to fraction form
    729.20/1,006.32 = 397.65/x
  3. Step 3: Cross multiply
    729.20x = 1,006.32 × 397.65
  4. Step 4: Simplify right side
    729.20x = 400,161.34
  5. Step 5: Solve for x
    x = 400,161.34/729.20
  6. Step 6: Final answer
    x = 548.77

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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.