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Finding the Fourth Proportional to 511.31, 766.39 and 218.73

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Solution

The fourth proportional to 511.31, 766.39 and 218.73 is: 327.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    511.31 : 766.39 = 218.73 : x
  2. Step 2: Convert to fraction form
    511.31/766.39 = 218.73/x
  3. Step 3: Cross multiply
    511.31x = 766.39 × 218.73
  4. Step 4: Simplify right side
    511.31x = 167,628.14
  5. Step 5: Solve for x
    x = 167,628.14/511.31
  6. Step 6: Final answer
    x = 327.84

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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.