Home / 3,172.88-4,379.78-2,840.72

Finding the Fourth Proportional to 3,172.88, 4,379.78 and 2,840.72

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Solution

The fourth proportional to 3,172.88, 4,379.78 and 2,840.72 is: 3,921.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,172.88 : 4,379.78 = 2,840.72 : x
  2. Step 2: Convert to fraction form
    3,172.88/4,379.78 = 2,840.72/x
  3. Step 3: Cross multiply
    3,172.88x = 4,379.78 × 2,840.72
  4. Step 4: Simplify right side
    3,172.88x = 12,441,728.64
  5. Step 5: Solve for x
    x = 12,441,728.64/3,172.88
  6. Step 6: Final answer
    x = 3,921.27

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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.