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Finding the Fourth Proportional to 3,208.76, 4,815.28 and 1,128.78

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Solution

The fourth proportional to 3,208.76, 4,815.28 and 1,128.78 is: 1,693.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,208.76 : 4,815.28 = 1,128.78 : x
  2. Step 2: Convert to fraction form
    3,208.76/4,815.28 = 1,128.78/x
  3. Step 3: Cross multiply
    3,208.76x = 4,815.28 × 1,128.78
  4. Step 4: Simplify right side
    3,208.76x = 5,435,391.76
  5. Step 5: Solve for x
    x = 5,435,391.76/3,208.76
  6. Step 6: Final answer
    x = 1,693.92

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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.