Home / 2,771.20-4,156.80-2,115.10

Finding the Fourth Proportional to 2,771.20, 4,156.80 and 2,115.10

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Solution

The fourth proportional to 2,771.20, 4,156.80 and 2,115.10 is: 3,172.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,771.20 : 4,156.80 = 2,115.10 : x
  2. Step 2: Convert to fraction form
    2,771.20/4,156.80 = 2,115.10/x
  3. Step 3: Cross multiply
    2,771.20x = 4,156.80 × 2,115.10
  4. Step 4: Simplify right side
    2,771.20x = 8,792,047.68
  5. Step 5: Solve for x
    x = 8,792,047.68/2,771.20
  6. Step 6: Final answer
    x = 3,172.65

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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.