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Finding the Fourth Proportional to 519.76, 779.16 and 439.12

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Solution

The fourth proportional to 519.76, 779.16 and 439.12 is: 658.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    519.76 : 779.16 = 439.12 : x
  2. Step 2: Convert to fraction form
    519.76/779.16 = 439.12/x
  3. Step 3: Cross multiply
    519.76x = 779.16 × 439.12
  4. Step 4: Simplify right side
    519.76x = 342,144.74
  5. Step 5: Solve for x
    x = 342,144.74/519.76
  6. Step 6: Final answer
    x = 658.27

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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.