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Finding the Fourth Proportional to 3,998.69, 5,998.00 and 3,121.92

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Solution

The fourth proportional to 3,998.69, 5,998.00 and 3,121.92 is: 4,682.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,998.69 : 5,998.00 = 3,121.92 : x
  2. Step 2: Convert to fraction form
    3,998.69/5,998.00 = 3,121.92/x
  3. Step 3: Cross multiply
    3,998.69x = 5,998.00 × 3,121.92
  4. Step 4: Simplify right side
    3,998.69x = 18,725,284.77
  5. Step 5: Solve for x
    x = 18,725,284.77/3,998.69
  6. Step 6: Final answer
    x = 4,682.86

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1.5x scale

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.