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Finding the Fourth Proportional to 519.91, 717.28 and 310.12

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Solution

The fourth proportional to 519.91, 717.28 and 310.12 is: 427.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    519.91 : 717.28 = 310.12 : x
  2. Step 2: Convert to fraction form
    519.91/717.28 = 310.12/x
  3. Step 3: Cross multiply
    519.91x = 717.28 × 310.12
  4. Step 4: Simplify right side
    519.91x = 222,440.31
  5. Step 5: Solve for x
    x = 222,440.31/519.91
  6. Step 6: Final answer
    x = 427.85

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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.