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Finding the Fourth Proportional to 725.76, 1,087.83 and 286.61

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Solution

The fourth proportional to 725.76, 1,087.83 and 286.61 is: 429.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    725.76 : 1,087.83 = 286.61 : x
  2. Step 2: Convert to fraction form
    725.76/1,087.83 = 286.61/x
  3. Step 3: Cross multiply
    725.76x = 1,087.83 × 286.61
  4. Step 4: Simplify right side
    725.76x = 311,777.52
  5. Step 5: Solve for x
    x = 311,777.52/725.76
  6. Step 6: Final answer
    x = 429.59

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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.