Home / 3,128.80-4,680.48-2,855.20

Finding the Fourth Proportional to 3,128.80, 4,680.48 and 2,855.20

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Solution

The fourth proportional to 3,128.80, 4,680.48 and 2,855.20 is: 4,271.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,128.80 : 4,680.48 = 2,855.20 : x
  2. Step 2: Convert to fraction form
    3,128.80/4,680.48 = 2,855.20/x
  3. Step 3: Cross multiply
    3,128.80x = 4,680.48 × 2,855.20
  4. Step 4: Simplify right side
    3,128.80x = 13,363,706.50
  5. Step 5: Solve for x
    x = 13,363,706.50/3,128.80
  6. Step 6: Final answer
    x = 4,271.19

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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.