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Finding the Fourth Proportional to 725.88, 1,086.87 and 417.27

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Solution

The fourth proportional to 725.88, 1,086.87 and 417.27 is: 624.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    725.88 : 1,086.87 = 417.27 : x
  2. Step 2: Convert to fraction form
    725.88/1,086.87 = 417.27/x
  3. Step 3: Cross multiply
    725.88x = 1,086.87 × 417.27
  4. Step 4: Simplify right side
    725.88x = 453,518.24
  5. Step 5: Solve for x
    x = 453,518.24/725.88
  6. Step 6: Final answer
    x = 624.78

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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.