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Finding the Fourth Proportional to 721.89, 1,081.62 and 397.49

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Solution

The fourth proportional to 721.89, 1,081.62 and 397.49 is: 595.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.89 : 1,081.62 = 397.49 : x
  2. Step 2: Convert to fraction form
    721.89/1,081.62 = 397.49/x
  3. Step 3: Cross multiply
    721.89x = 1,081.62 × 397.49
  4. Step 4: Simplify right side
    721.89x = 429,927.73
  5. Step 5: Solve for x
    x = 429,927.73/721.89
  6. Step 6: Final answer
    x = 595.56

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.