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Finding the Fourth Proportional to 769.50, 1,148.28 and 687.49

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Solution

The fourth proportional to 769.50, 1,148.28 and 687.49 is: 1,025.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    769.50 : 1,148.28 = 687.49 : x
  2. Step 2: Convert to fraction form
    769.50/1,148.28 = 687.49/x
  3. Step 3: Cross multiply
    769.50x = 1,148.28 × 687.49
  4. Step 4: Simplify right side
    769.50x = 789,425.57
  5. Step 5: Solve for x
    x = 789,425.57/769.50
  6. Step 6: Final answer
    x = 1,025.89

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.