Home / 3,912.18-5,398.78-2,143.78

Finding the Fourth Proportional to 3,912.18, 5,398.78 and 2,143.78

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Solution

The fourth proportional to 3,912.18, 5,398.78 and 2,143.78 is: 2,958.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,912.18 : 5,398.78 = 2,143.78 : x
  2. Step 2: Convert to fraction form
    3,912.18/5,398.78 = 2,143.78/x
  3. Step 3: Cross multiply
    3,912.18x = 5,398.78 × 2,143.78
  4. Step 4: Simplify right side
    3,912.18x = 11,573,796.59
  5. Step 5: Solve for x
    x = 11,573,796.59/3,912.18
  6. Step 6: Final answer
    x = 2,958.40

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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.