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Finding the Fourth Proportional to 3,998.40, 5,997.60 and 2,692.80

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Solution

The fourth proportional to 3,998.40, 5,997.60 and 2,692.80 is: 4,039.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,998.40 : 5,997.60 = 2,692.80 : x
  2. Step 2: Convert to fraction form
    3,998.40/5,997.60 = 2,692.80/x
  3. Step 3: Cross multiply
    3,998.40x = 5,997.60 × 2,692.80
  4. Step 4: Simplify right side
    3,998.40x = 16,150,337.28
  5. Step 5: Solve for x
    x = 16,150,337.28/3,998.40
  6. Step 6: Final answer
    x = 4,039.20

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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.