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Finding the Fourth Proportional to 725.05, 1,086.15 and 358.73

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Solution

The fourth proportional to 725.05, 1,086.15 and 358.73 is: 537.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    725.05 : 1,086.15 = 358.73 : x
  2. Step 2: Convert to fraction form
    725.05/1,086.15 = 358.73/x
  3. Step 3: Cross multiply
    725.05x = 1,086.15 × 358.73
  4. Step 4: Simplify right side
    725.05x = 389,629.16
  5. Step 5: Solve for x
    x = 389,629.16/725.05
  6. Step 6: Final answer
    x = 537.38

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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.