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Finding the Fourth Proportional to 8,149.60, 12,213.60 and 7,220.80

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Solution

The fourth proportional to 8,149.60, 12,213.60 and 7,220.80 is: 10,821.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,149.60 : 12,213.60 = 7,220.80 : x
  2. Step 2: Convert to fraction form
    8,149.60/12,213.60 = 7,220.80/x
  3. Step 3: Cross multiply
    8,149.60x = 12,213.60 × 7,220.80
  4. Step 4: Simplify right side
    8,149.60x = 88,191,962.88
  5. Step 5: Solve for x
    x = 88,191,962.88/8,149.60
  6. Step 6: Final answer
    x = 10,821.63

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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.