Home / 3,939.21-5,431.59-2,942.79

Finding the Fourth Proportional to 3,939.21, 5,431.59 and 2,942.79

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Solution

The fourth proportional to 3,939.21, 5,431.59 and 2,942.79 is: 4,057.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,939.21 : 5,431.59 = 2,942.79 : x
  2. Step 2: Convert to fraction form
    3,939.21/5,431.59 = 2,942.79/x
  3. Step 3: Cross multiply
    3,939.21x = 5,431.59 × 2,942.79
  4. Step 4: Simplify right side
    3,939.21x = 15,984,028.74
  5. Step 5: Solve for x
    x = 15,984,028.74/3,939.21
  6. Step 6: Final answer
    x = 4,057.67

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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.