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Finding the Fourth Proportional to 831, 1,244.88 and 768

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Solution

The fourth proportional to 831, 1,244.88 and 768 is: 1,150.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    831 : 1,244.88 = 768 : x
  2. Step 2: Convert to fraction form
    831/1,244.88 = 768/x
  3. Step 3: Cross multiply
    831x = 1,244.88 × 768
  4. Step 4: Simplify right side
    831x = 956,067.84
  5. Step 5: Solve for x
    x = 956,067.84/831
  6. Step 6: Final answer
    x = 1,150.50

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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.