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Finding the Fourth Proportional to 7,680.40, 11,520.60 and 5,736.40

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Solution

The fourth proportional to 7,680.40, 11,520.60 and 5,736.40 is: 8,604.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,680.40 : 11,520.60 = 5,736.40 : x
  2. Step 2: Convert to fraction form
    7,680.40/11,520.60 = 5,736.40/x
  3. Step 3: Cross multiply
    7,680.40x = 11,520.60 × 5,736.40
  4. Step 4: Simplify right side
    7,680.40x = 66,086,769.84
  5. Step 5: Solve for x
    x = 66,086,769.84/7,680.40
  6. Step 6: Final answer
    x = 8,604.60

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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.