Home / 2,305.80-3,181.31-1,311.09

Finding the Fourth Proportional to 2,305.80, 3,181.31 and 1,311.09

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Solution

The fourth proportional to 2,305.80, 3,181.31 and 1,311.09 is: 1,808.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,305.80 : 3,181.31 = 1,311.09 : x
  2. Step 2: Convert to fraction form
    2,305.80/3,181.31 = 1,311.09/x
  3. Step 3: Cross multiply
    2,305.80x = 3,181.31 × 1,311.09
  4. Step 4: Simplify right side
    2,305.80x = 4,170,970.16
  5. Step 5: Solve for x
    x = 4,170,970.16/2,305.80
  6. Step 6: Final answer
    x = 1,808.90

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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.