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Finding the Fourth Proportional to 511.71, 766.81 and 218.81

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Solution

The fourth proportional to 511.71, 766.81 and 218.81 is: 327.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    511.71 : 766.81 = 218.81 : x
  2. Step 2: Convert to fraction form
    511.71/766.81 = 218.81/x
  3. Step 3: Cross multiply
    511.71x = 766.81 × 218.81
  4. Step 4: Simplify right side
    511.71x = 167,785.70
  5. Step 5: Solve for x
    x = 167,785.70/511.71
  6. Step 6: Final answer
    x = 327.89

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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.