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Finding the Fourth Proportional to 725.45, 1,087.82 and 417.21

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Solution

The fourth proportional to 725.45, 1,087.82 and 417.21 is: 625.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    725.45 : 1,087.82 = 417.21 : x
  2. Step 2: Convert to fraction form
    725.45/1,087.82 = 417.21/x
  3. Step 3: Cross multiply
    725.45x = 1,087.82 × 417.21
  4. Step 4: Simplify right side
    725.45x = 453,849.38
  5. Step 5: Solve for x
    x = 453,849.38/725.45
  6. Step 6: Final answer
    x = 625.61

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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.