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Finding the Fourth Proportional to 725.54, 1,089.32 and 379.13

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Solution

The fourth proportional to 725.54, 1,089.32 and 379.13 is: 569.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    725.54 : 1,089.32 = 379.13 : x
  2. Step 2: Convert to fraction form
    725.54/1,089.32 = 379.13/x
  3. Step 3: Cross multiply
    725.54x = 1,089.32 × 379.13
  4. Step 4: Simplify right side
    725.54x = 412,986.55
  5. Step 5: Solve for x
    x = 412,986.55/725.54
  6. Step 6: Final answer
    x = 569.22

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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.