Home / 5,422.80-8,128.74-2,138.22

Finding the Fourth Proportional to 5,422.80, 8,128.74 and 2,138.22

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Solution

The fourth proportional to 5,422.80, 8,128.74 and 2,138.22 is: 3,205.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,422.80 : 8,128.74 = 2,138.22 : x
  2. Step 2: Convert to fraction form
    5,422.80/8,128.74 = 2,138.22/x
  3. Step 3: Cross multiply
    5,422.80x = 8,128.74 × 2,138.22
  4. Step 4: Simplify right side
    5,422.80x = 17,381,034.44
  5. Step 5: Solve for x
    x = 17,381,034.44/5,422.80
  6. Step 6: Final answer
    x = 3,205.18

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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.