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Finding the Fourth Proportional to 766.31, 1,149.50 and 218.45

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Solution

The fourth proportional to 766.31, 1,149.50 and 218.45 is: 327.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    766.31 : 1,149.50 = 218.45 : x
  2. Step 2: Convert to fraction form
    766.31/1,149.50 = 218.45/x
  3. Step 3: Cross multiply
    766.31x = 1,149.50 × 218.45
  4. Step 4: Simplify right side
    766.31x = 251,103.07
  5. Step 5: Solve for x
    x = 251,103.07/766.31
  6. Step 6: Final answer
    x = 327.68

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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.