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Finding the Fourth Proportional to 519.30, 778.91 and 211.19

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Solution

The fourth proportional to 519.30, 778.91 and 211.19 is: 316.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    519.30 : 778.91 = 211.19 : x
  2. Step 2: Convert to fraction form
    519.30/778.91 = 211.19/x
  3. Step 3: Cross multiply
    519.30x = 778.91 × 211.19
  4. Step 4: Simplify right side
    519.30x = 164,493.05
  5. Step 5: Solve for x
    x = 164,493.05/519.30
  6. Step 6: Final answer
    x = 316.76

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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.