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Finding the Fourth Proportional to 519.90, 717.12 and 323.28

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Solution

The fourth proportional to 519.90, 717.12 and 323.28 is: 445.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    519.90 : 717.12 = 323.28 : x
  2. Step 2: Convert to fraction form
    519.90/717.12 = 323.28/x
  3. Step 3: Cross multiply
    519.90x = 717.12 × 323.28
  4. Step 4: Simplify right side
    519.90x = 231,830.55
  5. Step 5: Solve for x
    x = 231,830.55/519.90
  6. Step 6: Final answer
    x = 445.91

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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.