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Finding the Fourth Proportional to 519.98, 717.50 and 287.09

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Solution

The fourth proportional to 519.98, 717.50 and 287.09 is: 396.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    519.98 : 717.50 = 287.09 : x
  2. Step 2: Convert to fraction form
    519.98/717.50 = 287.09/x
  3. Step 3: Cross multiply
    519.98x = 717.50 × 287.09
  4. Step 4: Simplify right side
    519.98x = 205,983.49
  5. Step 5: Solve for x
    x = 205,983.49/519.98
  6. Step 6: Final answer
    x = 396.14

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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.