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Finding the Fourth Proportional to 725.14, 1,087.91 and 262.90

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Solution

The fourth proportional to 725.14, 1,087.91 and 262.90 is: 394.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    725.14 : 1,087.91 = 262.90 : x
  2. Step 2: Convert to fraction form
    725.14/1,087.91 = 262.90/x
  3. Step 3: Cross multiply
    725.14x = 1,087.91 × 262.90
  4. Step 4: Simplify right side
    725.14x = 286,011.54
  5. Step 5: Solve for x
    x = 286,011.54/725.14
  6. Step 6: Final answer
    x = 394.42

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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.