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Finding the Fourth Proportional to 511.01, 766.78 and 218.47

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Solution

The fourth proportional to 511.01, 766.78 and 218.47 is: 327.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    511.01 : 766.78 = 218.47 : x
  2. Step 2: Convert to fraction form
    511.01/766.78 = 218.47/x
  3. Step 3: Cross multiply
    511.01x = 766.78 × 218.47
  4. Step 4: Simplify right side
    511.01x = 167,514.59
  5. Step 5: Solve for x
    x = 167,514.59/511.01
  6. Step 6: Final answer
    x = 327.81

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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.