Home / 3,138.60-4,331.16-1,812.09

Finding the Fourth Proportional to 3,138.60, 4,331.16 and 1,812.09

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Solution

The fourth proportional to 3,138.60, 4,331.16 and 1,812.09 is: 2,500.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,138.60 : 4,331.16 = 1,812.09 : x
  2. Step 2: Convert to fraction form
    3,138.60/4,331.16 = 1,812.09/x
  3. Step 3: Cross multiply
    3,138.60x = 4,331.16 × 1,812.09
  4. Step 4: Simplify right side
    3,138.60x = 7,848,451.72
  5. Step 5: Solve for x
    x = 7,848,451.72/3,138.60
  6. Step 6: Final answer
    x = 2,500.62

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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.