Home / 3,913.37-5,400.38-2,120.80

Finding the Fourth Proportional to 3,913.37, 5,400.38 and 2,120.80

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Solution

The fourth proportional to 3,913.37, 5,400.38 and 2,120.80 is: 2,926.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,913.37 : 5,400.38 = 2,120.80 : x
  2. Step 2: Convert to fraction form
    3,913.37/5,400.38 = 2,120.80/x
  3. Step 3: Cross multiply
    3,913.37x = 5,400.38 × 2,120.80
  4. Step 4: Simplify right side
    3,913.37x = 11,453,137.96
  5. Step 5: Solve for x
    x = 11,453,137.96/3,913.37
  6. Step 6: Final answer
    x = 2,926.67

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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.