Home / 3,906.74-5,390.85-2,138.18

Finding the Fourth Proportional to 3,906.74, 5,390.85 and 2,138.18

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Solution

The fourth proportional to 3,906.74, 5,390.85 and 2,138.18 is: 2,950.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,906.74 : 5,390.85 = 2,138.18 : x
  2. Step 2: Convert to fraction form
    3,906.74/5,390.85 = 2,138.18/x
  3. Step 3: Cross multiply
    3,906.74x = 5,390.85 × 2,138.18
  4. Step 4: Simplify right side
    3,906.74x = 11,526,607.65
  5. Step 5: Solve for x
    x = 11,526,607.65/3,906.74
  6. Step 6: Final answer
    x = 2,950.44

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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.