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Finding the Fourth Proportional to 6,919.68, 10,379.25 and 1,989.30

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Solution

The fourth proportional to 6,919.68, 10,379.25 and 1,989.30 is: 2,983.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,919.68 : 10,379.25 = 1,989.30 : x
  2. Step 2: Convert to fraction form
    6,919.68/10,379.25 = 1,989.30/x
  3. Step 3: Cross multiply
    6,919.68x = 10,379.25 × 1,989.30
  4. Step 4: Simplify right side
    6,919.68x = 20,647,442.03
  5. Step 5: Solve for x
    x = 20,647,442.03/6,919.68
  6. Step 6: Final answer
    x = 2,983.87

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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.