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Finding the Fourth Proportional to 7,138.44, 9,850.50 and 3,994.20

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Solution

The fourth proportional to 7,138.44, 9,850.50 and 3,994.20 is: 5,511.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,138.44 : 9,850.50 = 3,994.20 : x
  2. Step 2: Convert to fraction form
    7,138.44/9,850.50 = 3,994.20/x
  3. Step 3: Cross multiply
    7,138.44x = 9,850.50 × 3,994.20
  4. Step 4: Simplify right side
    7,138.44x = 39,344,867.10
  5. Step 5: Solve for x
    x = 39,344,867.10/7,138.44
  6. Step 6: Final answer
    x = 5,511.69

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.