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Finding the Fourth Proportional to 519.80, 717.26 and 298.78

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Solution

The fourth proportional to 519.80, 717.26 and 298.78 is: 412.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    519.80 : 717.26 = 298.78 : x
  2. Step 2: Convert to fraction form
    519.80/717.26 = 298.78/x
  3. Step 3: Cross multiply
    519.80x = 717.26 × 298.78
  4. Step 4: Simplify right side
    519.80x = 214,301.90
  5. Step 5: Solve for x
    x = 214,301.90/519.80
  6. Step 6: Final answer
    x = 412.28

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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.