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Finding the Fourth Proportional to 769.89, 1,154.82 and 192.75

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Solution

The fourth proportional to 769.89, 1,154.82 and 192.75 is: 289.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    769.89 : 1,154.82 = 192.75 : x
  2. Step 2: Convert to fraction form
    769.89/1,154.82 = 192.75/x
  3. Step 3: Cross multiply
    769.89x = 1,154.82 × 192.75
  4. Step 4: Simplify right side
    769.89x = 222,591.56
  5. Step 5: Solve for x
    x = 222,591.56/769.89
  6. Step 6: Final answer
    x = 289.12

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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.