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Finding the Fourth Proportional to 519.99, 717.64 and 287.19

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Solution

The fourth proportional to 519.99, 717.64 and 287.19 is: 396.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    519.99 : 717.64 = 287.19 : x
  2. Step 2: Convert to fraction form
    519.99/717.64 = 287.19/x
  3. Step 3: Cross multiply
    519.99x = 717.64 × 287.19
  4. Step 4: Simplify right side
    519.99x = 206,097.60
  5. Step 5: Solve for x
    x = 206,097.60/519.99
  6. Step 6: Final answer
    x = 396.35

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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.