Home / 3,911.79-5,398.35-2,143.29

Finding the Fourth Proportional to 3,911.79, 5,398.35 and 2,143.29

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Solution

The fourth proportional to 3,911.79, 5,398.35 and 2,143.29 is: 2,957.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,911.79 : 5,398.35 = 2,143.29 : x
  2. Step 2: Convert to fraction form
    3,911.79/5,398.35 = 2,143.29/x
  3. Step 3: Cross multiply
    3,911.79x = 5,398.35 × 2,143.29
  4. Step 4: Simplify right side
    3,911.79x = 11,570,229.57
  5. Step 5: Solve for x
    x = 11,570,229.57/3,911.79
  6. Step 6: Final answer
    x = 2,957.78

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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.