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Finding the Fourth Proportional to 725.19, 1,087.83 and 198.18

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Solution

The fourth proportional to 725.19, 1,087.83 and 198.18 is: 297.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    725.19 : 1,087.83 = 198.18 : x
  2. Step 2: Convert to fraction form
    725.19/1,087.83 = 198.18/x
  3. Step 3: Cross multiply
    725.19x = 1,087.83 × 198.18
  4. Step 4: Simplify right side
    725.19x = 215,586.15
  5. Step 5: Solve for x
    x = 215,586.15/725.19
  6. Step 6: Final answer
    x = 297.28

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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.