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Finding the Fourth Proportional to 519.44, 779.90 and 447.28

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Solution

The fourth proportional to 519.44, 779.90 and 447.28 is: 671.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    519.44 : 779.90 = 447.28 : x
  2. Step 2: Convert to fraction form
    519.44/779.90 = 447.28/x
  3. Step 3: Cross multiply
    519.44x = 779.90 × 447.28
  4. Step 4: Simplify right side
    519.44x = 348,833.67
  5. Step 5: Solve for x
    x = 348,833.67/519.44
  6. Step 6: Final answer
    x = 671.56

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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.