Home / 3,138.57-4,331.07-1,812.20

Finding the Fourth Proportional to 3,138.57, 4,331.07 and 1,812.20

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Solution

The fourth proportional to 3,138.57, 4,331.07 and 1,812.20 is: 2,500.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,138.57 : 4,331.07 = 1,812.20 : x
  2. Step 2: Convert to fraction form
    3,138.57/4,331.07 = 1,812.20/x
  3. Step 3: Cross multiply
    3,138.57x = 4,331.07 × 1,812.20
  4. Step 4: Simplify right side
    3,138.57x = 7,848,743.40
  5. Step 5: Solve for x
    x = 7,848,743.40/3,138.57
  6. Step 6: Final answer
    x = 2,500.74

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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.