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Finding the Fourth Proportional to 519.21, 779.12 and 439.02

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Solution

The fourth proportional to 519.21, 779.12 and 439.02 is: 658.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    519.21 : 779.12 = 439.02 : x
  2. Step 2: Convert to fraction form
    519.21/779.12 = 439.02/x
  3. Step 3: Cross multiply
    519.21x = 779.12 × 439.02
  4. Step 4: Simplify right side
    519.21x = 342,048.71
  5. Step 5: Solve for x
    x = 342,048.71/519.21
  6. Step 6: Final answer
    x = 658.79

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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.