Home / 2,021.21-2,789.92-1,311.79

Finding the Fourth Proportional to 2,021.21, 2,789.92 and 1,311.79

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Solution

The fourth proportional to 2,021.21, 2,789.92 and 1,311.79 is: 1,810.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,021.21 : 2,789.92 = 1,311.79 : x
  2. Step 2: Convert to fraction form
    2,021.21/2,789.92 = 1,311.79/x
  3. Step 3: Cross multiply
    2,021.21x = 2,789.92 × 1,311.79
  4. Step 4: Simplify right side
    2,021.21x = 3,659,782.60
  5. Step 5: Solve for x
    x = 3,659,782.60/2,021.21
  6. Step 6: Final answer
    x = 1,810.69

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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.