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Finding the Fourth Proportional to 3,911.73, 5,398.17 and 2,143.38

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Solution

The fourth proportional to 3,911.73, 5,398.17 and 2,143.38 is: 2,957.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,911.73 : 5,398.17 = 2,143.38 : x
  2. Step 2: Convert to fraction form
    3,911.73/5,398.17 = 2,143.38/x
  3. Step 3: Cross multiply
    3,911.73x = 5,398.17 × 2,143.38
  4. Step 4: Simplify right side
    3,911.73x = 11,570,329.61
  5. Step 5: Solve for x
    x = 11,570,329.61/3,911.73
  6. Step 6: Final answer
    x = 2,957.85

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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.