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Finding the Fourth Proportional to 519.41, 716.99 and 309.78

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Solution

The fourth proportional to 519.41, 716.99 and 309.78 is: 427.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    519.41 : 716.99 = 309.78 : x
  2. Step 2: Convert to fraction form
    519.41/716.99 = 309.78/x
  3. Step 3: Cross multiply
    519.41x = 716.99 × 309.78
  4. Step 4: Simplify right side
    519.41x = 222,107.61
  5. Step 5: Solve for x
    x = 222,107.61/519.41
  6. Step 6: Final answer
    x = 427.61

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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.