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Finding the Fourth Proportional to 519.95, 779.31 and 211.73

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Solution

The fourth proportional to 519.95, 779.31 and 211.73 is: 317.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    519.95 : 779.31 = 211.73 : x
  2. Step 2: Convert to fraction form
    519.95/779.31 = 211.73/x
  3. Step 3: Cross multiply
    519.95x = 779.31 × 211.73
  4. Step 4: Simplify right side
    519.95x = 164,999.41
  5. Step 5: Solve for x
    x = 164,999.41/519.95
  6. Step 6: Final answer
    x = 317.34

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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.