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Finding the Fourth Proportional to 766.75, 1,149.11 and 279.33

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Solution

The fourth proportional to 766.75, 1,149.11 and 279.33 is: 418.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    766.75 : 1,149.11 = 279.33 : x
  2. Step 2: Convert to fraction form
    766.75/1,149.11 = 279.33/x
  3. Step 3: Cross multiply
    766.75x = 1,149.11 × 279.33
  4. Step 4: Simplify right side
    766.75x = 320,980.90
  5. Step 5: Solve for x
    x = 320,980.90/766.75
  6. Step 6: Final answer
    x = 418.63

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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.