Home / 3,215.79-4,439.97-2,021.31

Finding the Fourth Proportional to 3,215.79, 4,439.97 and 2,021.31

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Solution

The fourth proportional to 3,215.79, 4,439.97 and 2,021.31 is: 2,790.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,215.79 : 4,439.97 = 2,021.31 : x
  2. Step 2: Convert to fraction form
    3,215.79/4,439.97 = 2,021.31/x
  3. Step 3: Cross multiply
    3,215.79x = 4,439.97 × 2,021.31
  4. Step 4: Simplify right side
    3,215.79x = 8,974,555.76
  5. Step 5: Solve for x
    x = 8,974,555.76/3,215.79
  6. Step 6: Final answer
    x = 2,790.78

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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.