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Finding the Fourth Proportional to 3,453.88, 5,176.71 and 1,990

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Solution

The fourth proportional to 3,453.88, 5,176.71 and 1,990 is: 2,982.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,453.88 : 5,176.71 = 1,990 : x
  2. Step 2: Convert to fraction form
    3,453.88/5,176.71 = 1,990/x
  3. Step 3: Cross multiply
    3,453.88x = 5,176.71 × 1,990
  4. Step 4: Simplify right side
    3,453.88x = 10,301,652.90
  5. Step 5: Solve for x
    x = 10,301,652.90/3,453.88
  6. Step 6: Final answer
    x = 2,982.63

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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.