Home / 2,821.34-3,920.30-2,790.92

Finding the Fourth Proportional to 2,821.34, 3,920.30 and 2,790.92

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Solution

The fourth proportional to 2,821.34, 3,920.30 and 2,790.92 is: 3,878.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,821.34 : 3,920.30 = 2,790.92 : x
  2. Step 2: Convert to fraction form
    2,821.34/3,920.30 = 2,790.92/x
  3. Step 3: Cross multiply
    2,821.34x = 3,920.30 × 2,790.92
  4. Step 4: Simplify right side
    2,821.34x = 10,941,243.68
  5. Step 5: Solve for x
    x = 10,941,243.68/2,821.34
  6. Step 6: Final answer
    x = 3,878.03

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.