Home / 8,211.20-12,309.60-4,920.80

Finding the Fourth Proportional to 8,211.20, 12,309.60 and 4,920.80

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Solution

The fourth proportional to 8,211.20, 12,309.60 and 4,920.80 is: 7,376.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,211.20 : 12,309.60 = 4,920.80 : x
  2. Step 2: Convert to fraction form
    8,211.20/12,309.60 = 4,920.80/x
  3. Step 3: Cross multiply
    8,211.20x = 12,309.60 × 4,920.80
  4. Step 4: Simplify right side
    8,211.20x = 60,573,079.68
  5. Step 5: Solve for x
    x = 60,573,079.68/8,211.20
  6. Step 6: Final answer
    x = 7,376.89

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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.