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Finding the Fourth Proportional to 3,911.92, 5,398.46 and 2,143.64

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Solution

The fourth proportional to 3,911.92, 5,398.46 and 2,143.64 is: 2,958.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,911.92 : 5,398.46 = 2,143.64 : x
  2. Step 2: Convert to fraction form
    3,911.92/5,398.46 = 2,143.64/x
  3. Step 3: Cross multiply
    3,911.92x = 5,398.46 × 2,143.64
  4. Step 4: Simplify right side
    3,911.92x = 11,572,354.79
  5. Step 5: Solve for x
    x = 11,572,354.79/3,911.92
  6. Step 6: Final answer
    x = 2,958.23

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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.