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Finding the Fourth Proportional to 519.90, 717.49 and 287.02

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Solution

The fourth proportional to 519.90, 717.49 and 287.02 is: 396.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    519.90 : 717.49 = 287.02 : x
  2. Step 2: Convert to fraction form
    519.90/717.49 = 287.02/x
  3. Step 3: Cross multiply
    519.90x = 717.49 × 287.02
  4. Step 4: Simplify right side
    519.90x = 205,933.98
  5. Step 5: Solve for x
    x = 205,933.98/519.90
  6. Step 6: Final answer
    x = 396.10

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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.