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Finding the Fourth Proportional to 725.35, 1,087.34 and 238.08

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Solution

The fourth proportional to 725.35, 1,087.34 and 238.08 is: 356.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    725.35 : 1,087.34 = 238.08 : x
  2. Step 2: Convert to fraction form
    725.35/1,087.34 = 238.08/x
  3. Step 3: Cross multiply
    725.35x = 1,087.34 × 238.08
  4. Step 4: Simplify right side
    725.35x = 258,872.72
  5. Step 5: Solve for x
    x = 258,872.72/725.35
  6. Step 6: Final answer
    x = 356.90

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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.