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Finding the Fourth Proportional to 519.89, 717.42 and 287

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Solution

The fourth proportional to 519.89, 717.42 and 287 is: 396.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    519.89 : 717.42 = 287 : x
  2. Step 2: Convert to fraction form
    519.89/717.42 = 287/x
  3. Step 3: Cross multiply
    519.89x = 717.42 × 287
  4. Step 4: Simplify right side
    519.89x = 205,899.54
  5. Step 5: Solve for x
    x = 205,899.54/519.89
  6. Step 6: Final answer
    x = 396.04

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.