Home / 3,131.19-4,690.40-1,811.09

Finding the Fourth Proportional to 3,131.19, 4,690.40 and 1,811.09

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Solution

The fourth proportional to 3,131.19, 4,690.40 and 1,811.09 is: 2,712.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,131.19 : 4,690.40 = 1,811.09 : x
  2. Step 2: Convert to fraction form
    3,131.19/4,690.40 = 1,811.09/x
  3. Step 3: Cross multiply
    3,131.19x = 4,690.40 × 1,811.09
  4. Step 4: Simplify right side
    3,131.19x = 8,494,736.54
  5. Step 5: Solve for x
    x = 8,494,736.54/3,131.19
  6. Step 6: Final answer
    x = 2,712.94

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.