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Finding the Fourth Proportional to 3,906.37, 5,390.79 and 2,137.97

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Solution

The fourth proportional to 3,906.37, 5,390.79 and 2,137.97 is: 2,950.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,906.37 : 5,390.79 = 2,137.97 : x
  2. Step 2: Convert to fraction form
    3,906.37/5,390.79 = 2,137.97/x
  3. Step 3: Cross multiply
    3,906.37x = 5,390.79 × 2,137.97
  4. Step 4: Simplify right side
    3,906.37x = 11,525,347.30
  5. Step 5: Solve for x
    x = 11,525,347.30/3,906.37
  6. Step 6: Final answer
    x = 2,950.40

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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.