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Finding the Fourth Proportional to 519.88, 779.08 and 391.72

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Solution

The fourth proportional to 519.88, 779.08 and 391.72 is: 587.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    519.88 : 779.08 = 391.72 : x
  2. Step 2: Convert to fraction form
    519.88/779.08 = 391.72/x
  3. Step 3: Cross multiply
    519.88x = 779.08 × 391.72
  4. Step 4: Simplify right side
    519.88x = 305,181.22
  5. Step 5: Solve for x
    x = 305,181.22/519.88
  6. Step 6: Final answer
    x = 587.02

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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.