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Finding the Fourth Proportional to 769.14, 1,150.88 and 681.78

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Solution

The fourth proportional to 769.14, 1,150.88 and 681.78 is: 1,020.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    769.14 : 1,150.88 = 681.78 : x
  2. Step 2: Convert to fraction form
    769.14/1,150.88 = 681.78/x
  3. Step 3: Cross multiply
    769.14x = 1,150.88 × 681.78
  4. Step 4: Simplify right side
    769.14x = 784,646.97
  5. Step 5: Solve for x
    x = 784,646.97/769.14
  6. Step 6: Final answer
    x = 1,020.16

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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.