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Finding the Fourth Proportional to 519.80, 779.90 and 371.72

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Solution

The fourth proportional to 519.80, 779.90 and 371.72 is: 557.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    519.80 : 779.90 = 371.72 : x
  2. Step 2: Convert to fraction form
    519.80/779.90 = 371.72/x
  3. Step 3: Cross multiply
    519.80x = 779.90 × 371.72
  4. Step 4: Simplify right side
    519.80x = 289,909.47
  5. Step 5: Solve for x
    x = 289,909.47/519.80
  6. Step 6: Final answer
    x = 557.73

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.