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Finding the Fourth Proportional to 519.98, 717.54 and 287.11

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Solution

The fourth proportional to 519.98, 717.54 and 287.11 is: 396.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    519.98 : 717.54 = 287.11 : x
  2. Step 2: Convert to fraction form
    519.98/717.54 = 287.11/x
  3. Step 3: Cross multiply
    519.98x = 717.54 × 287.11
  4. Step 4: Simplify right side
    519.98x = 206,012.91
  5. Step 5: Solve for x
    x = 206,012.91/519.98
  6. Step 6: Final answer
    x = 396.19

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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.