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Finding the Fourth Proportional to 519.62, 717.08 and 309.80

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Solution

The fourth proportional to 519.62, 717.08 and 309.80 is: 427.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    519.62 : 717.08 = 309.80 : x
  2. Step 2: Convert to fraction form
    519.62/717.08 = 309.80/x
  3. Step 3: Cross multiply
    519.62x = 717.08 × 309.80
  4. Step 4: Simplify right side
    519.62x = 222,151.63
  5. Step 5: Solve for x
    x = 222,151.63/519.62
  6. Step 6: Final answer
    x = 427.53

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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.