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Finding the Fourth Proportional to 725.09, 1,084.89 and 620.96

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Solution

The fourth proportional to 725.09, 1,084.89 and 620.96 is: 929.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    725.09 : 1,084.89 = 620.96 : x
  2. Step 2: Convert to fraction form
    725.09/1,084.89 = 620.96/x
  3. Step 3: Cross multiply
    725.09x = 1,084.89 × 620.96
  4. Step 4: Simplify right side
    725.09x = 673,673.29
  5. Step 5: Solve for x
    x = 673,673.29/725.09
  6. Step 6: Final answer
    x = 929.09

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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.