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Finding the Fourth Proportional to 519.52, 717.02 and 309.81

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Solution

The fourth proportional to 519.52, 717.02 and 309.81 is: 427.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    519.52 : 717.02 = 309.81 : x
  2. Step 2: Convert to fraction form
    519.52/717.02 = 309.81/x
  3. Step 3: Cross multiply
    519.52x = 717.02 × 309.81
  4. Step 4: Simplify right side
    519.52x = 222,139.97
  5. Step 5: Solve for x
    x = 222,139.97/519.52
  6. Step 6: Final answer
    x = 427.59

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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.