Home / 3,938.09-5,434.55-2,145.57

Finding the Fourth Proportional to 3,938.09, 5,434.55 and 2,145.57

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Solution

The fourth proportional to 3,938.09, 5,434.55 and 2,145.57 is: 2,960.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,938.09 : 5,434.55 = 2,145.57 : x
  2. Step 2: Convert to fraction form
    3,938.09/5,434.55 = 2,145.57/x
  3. Step 3: Cross multiply
    3,938.09x = 5,434.55 × 2,145.57
  4. Step 4: Simplify right side
    3,938.09x = 11,660,183.31
  5. Step 5: Solve for x
    x = 11,660,183.31/3,938.09
  6. Step 6: Final answer
    x = 2,960.87

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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.