Home / 3,939.87-5,437.05-2,171.49

Finding the Fourth Proportional to 3,939.87, 5,437.05 and 2,171.49

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Solution

The fourth proportional to 3,939.87, 5,437.05 and 2,171.49 is: 2,996.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,939.87 : 5,437.05 = 2,171.49 : x
  2. Step 2: Convert to fraction form
    3,939.87/5,437.05 = 2,171.49/x
  3. Step 3: Cross multiply
    3,939.87x = 5,437.05 × 2,171.49
  4. Step 4: Simplify right side
    3,939.87x = 11,806,499.70
  5. Step 5: Solve for x
    x = 11,806,499.70/3,939.87
  6. Step 6: Final answer
    x = 2,996.67

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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.