Home / 8,220.40-12,330.60-3,290.80

Finding the Fourth Proportional to 8,220.40, 12,330.60 and 3,290.80

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Solution

The fourth proportional to 8,220.40, 12,330.60 and 3,290.80 is: 4,936.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,220.40 : 12,330.60 = 3,290.80 : x
  2. Step 2: Convert to fraction form
    8,220.40/12,330.60 = 3,290.80/x
  3. Step 3: Cross multiply
    8,220.40x = 12,330.60 × 3,290.80
  4. Step 4: Simplify right side
    8,220.40x = 40,577,538.48
  5. Step 5: Solve for x
    x = 40,577,538.48/8,220.40
  6. Step 6: Final answer
    x = 4,936.20

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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.