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Finding the Fourth Proportional to 3,200, 4,800 and 768

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Solution

The fourth proportional to 3,200, 4,800 and 768 is: 1,152

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,200 : 4,800 = 768 : x
  2. Step 2: Convert to fraction form
    3,200/4,800 = 768/x
  3. Step 3: Cross multiply
    3,200x = 4,800 × 768
  4. Step 4: Simplify right side
    3,200x = 3,686,400
  5. Step 5: Solve for x
    x = 3,686,400/3,200
  6. Step 6: Final answer
    x = 1,152

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.