Home / 3,111.90-4,292.91-1,991.94

Finding the Fourth Proportional to 3,111.90, 4,292.91 and 1,991.94

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Solution

The fourth proportional to 3,111.90, 4,292.91 and 1,991.94 is: 2,747.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,111.90 : 4,292.91 = 1,991.94 : x
  2. Step 2: Convert to fraction form
    3,111.90/4,292.91 = 1,991.94/x
  3. Step 3: Cross multiply
    3,111.90x = 4,292.91 × 1,991.94
  4. Step 4: Simplify right side
    3,111.90x = 8,551,219.15
  5. Step 5: Solve for x
    x = 8,551,219.15/3,111.90
  6. Step 6: Final answer
    x = 2,747.91

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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.