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Finding the Fourth Proportional to 725.32, 1,087.90 and 205.37

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Solution

The fourth proportional to 725.32, 1,087.90 and 205.37 is: 308.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    725.32 : 1,087.90 = 205.37 : x
  2. Step 2: Convert to fraction form
    725.32/1,087.90 = 205.37/x
  3. Step 3: Cross multiply
    725.32x = 1,087.90 × 205.37
  4. Step 4: Simplify right side
    725.32x = 223,420.15
  5. Step 5: Solve for x
    x = 223,420.15/725.32
  6. Step 6: Final answer
    x = 308.03

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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.