Home / 3,906.90-5,390.66-2,312.75

Finding the Fourth Proportional to 3,906.90, 5,390.66 and 2,312.75

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Solution

The fourth proportional to 3,906.90, 5,390.66 and 2,312.75 is: 3,191.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,906.90 : 5,390.66 = 2,312.75 : x
  2. Step 2: Convert to fraction form
    3,906.90/5,390.66 = 2,312.75/x
  3. Step 3: Cross multiply
    3,906.90x = 5,390.66 × 2,312.75
  4. Step 4: Simplify right side
    3,906.90x = 12,467,268.17
  5. Step 5: Solve for x
    x = 12,467,268.17/3,906.90
  6. Step 6: Final answer
    x = 3,191.09

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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.