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Finding the Fourth Proportional to 3,920.52, 5,410.20 and 2,127.92

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Solution

The fourth proportional to 3,920.52, 5,410.20 and 2,127.92 is: 2,936.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,920.52 : 5,410.20 = 2,127.92 : x
  2. Step 2: Convert to fraction form
    3,920.52/5,410.20 = 2,127.92/x
  3. Step 3: Cross multiply
    3,920.52x = 5,410.20 × 2,127.92
  4. Step 4: Simplify right side
    3,920.52x = 11,512,445.73
  5. Step 5: Solve for x
    x = 11,512,445.73/3,920.52
  6. Step 6: Final answer
    x = 2,936.46

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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.