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Finding the Fourth Proportional to 725.81, 1,089.10 and 396.98

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Solution

The fourth proportional to 725.81, 1,089.10 and 396.98 is: 595.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    725.81 : 1,089.10 = 396.98 : x
  2. Step 2: Convert to fraction form
    725.81/1,089.10 = 396.98/x
  3. Step 3: Cross multiply
    725.81x = 1,089.10 × 396.98
  4. Step 4: Simplify right side
    725.81x = 432,353.95
  5. Step 5: Solve for x
    x = 432,353.95/725.81
  6. Step 6: Final answer
    x = 595.68

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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.