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Finding the Fourth Proportional to 8,571.20, 12,842.40 and 4,179.20

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Solution

The fourth proportional to 8,571.20, 12,842.40 and 4,179.20 is: 6,261.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,571.20 : 12,842.40 = 4,179.20 : x
  2. Step 2: Convert to fraction form
    8,571.20/12,842.40 = 4,179.20/x
  3. Step 3: Cross multiply
    8,571.20x = 12,842.40 × 4,179.20
  4. Step 4: Simplify right side
    8,571.20x = 53,670,958.08
  5. Step 5: Solve for x
    x = 53,670,958.08/8,571.20
  6. Step 6: Final answer
    x = 6,261.78

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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.