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Finding the Fourth Proportional to 3,289.70, 4,928.99 and 1,988.44

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Solution

The fourth proportional to 3,289.70, 4,928.99 and 1,988.44 is: 2,979.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,289.70 : 4,928.99 = 1,988.44 : x
  2. Step 2: Convert to fraction form
    3,289.70/4,928.99 = 1,988.44/x
  3. Step 3: Cross multiply
    3,289.70x = 4,928.99 × 1,988.44
  4. Step 4: Simplify right side
    3,289.70x = 9,800,978.61
  5. Step 5: Solve for x
    x = 9,800,978.61/3,289.70
  6. Step 6: Final answer
    x = 2,979.29

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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.