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Finding the Fourth Proportional to 766.89, 1,150.42 and 219.09

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Solution

The fourth proportional to 766.89, 1,150.42 and 219.09 is: 328.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    766.89 : 1,150.42 = 219.09 : x
  2. Step 2: Convert to fraction form
    766.89/1,150.42 = 219.09/x
  3. Step 3: Cross multiply
    766.89x = 1,150.42 × 219.09
  4. Step 4: Simplify right side
    766.89x = 252,045.52
  5. Step 5: Solve for x
    x = 252,045.52/766.89
  6. Step 6: Final answer
    x = 328.66

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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.