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Finding the Fourth Proportional to 519.86, 717.17 and 309.92

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Solution

The fourth proportional to 519.86, 717.17 and 309.92 is: 427.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    519.86 : 717.17 = 309.92 : x
  2. Step 2: Convert to fraction form
    519.86/717.17 = 309.92/x
  3. Step 3: Cross multiply
    519.86x = 717.17 × 309.92
  4. Step 4: Simplify right side
    519.86x = 222,265.57
  5. Step 5: Solve for x
    x = 222,265.57/519.86
  6. Step 6: Final answer
    x = 427.55

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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.