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Finding the Fourth Proportional to 5,453.56, 8,178.72 and 1,990

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Solution

The fourth proportional to 5,453.56, 8,178.72 and 1,990 is: 2,984.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,453.56 : 8,178.72 = 1,990 : x
  2. Step 2: Convert to fraction form
    5,453.56/8,178.72 = 1,990/x
  3. Step 3: Cross multiply
    5,453.56x = 8,178.72 × 1,990
  4. Step 4: Simplify right side
    5,453.56x = 16,275,652.80
  5. Step 5: Solve for x
    x = 16,275,652.80/5,453.56
  6. Step 6: Final answer
    x = 2,984.41

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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.