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Finding the Fourth Proportional to 519.41, 779.42 and 518.20

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Solution

The fourth proportional to 519.41, 779.42 and 518.20 is: 777.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    519.41 : 779.42 = 518.20 : x
  2. Step 2: Convert to fraction form
    519.41/779.42 = 518.20/x
  3. Step 3: Cross multiply
    519.41x = 779.42 × 518.20
  4. Step 4: Simplify right side
    519.41x = 403,894.79
  5. Step 5: Solve for x
    x = 403,894.79/519.41
  6. Step 6: Final answer
    x = 777.60

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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.