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Finding the Fourth Proportional to 766.41, 1,149.65 and 218.55

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Solution

The fourth proportional to 766.41, 1,149.65 and 218.55 is: 327.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    766.41 : 1,149.65 = 218.55 : x
  2. Step 2: Convert to fraction form
    766.41/1,149.65 = 218.55/x
  3. Step 3: Cross multiply
    766.41x = 1,149.65 × 218.55
  4. Step 4: Simplify right side
    766.41x = 251,256.01
  5. Step 5: Solve for x
    x = 251,256.01/766.41
  6. Step 6: Final answer
    x = 327.83

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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.