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Finding the Fourth Proportional to 3,218.95, 4,828.73 and 1,138.73

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Solution

The fourth proportional to 3,218.95, 4,828.73 and 1,138.73 is: 1,708.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,218.95 : 4,828.73 = 1,138.73 : x
  2. Step 2: Convert to fraction form
    3,218.95/4,828.73 = 1,138.73/x
  3. Step 3: Cross multiply
    3,218.95x = 4,828.73 × 1,138.73
  4. Step 4: Simplify right side
    3,218.95x = 5,498,619.71
  5. Step 5: Solve for x
    x = 5,498,619.71/3,218.95
  6. Step 6: Final answer
    x = 1,708.20

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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.