Home / 8,104.20-12,155.40-6,640.80

Finding the Fourth Proportional to 8,104.20, 12,155.40 and 6,640.80

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Solution

The fourth proportional to 8,104.20, 12,155.40 and 6,640.80 is: 9,960.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,104.20 : 12,155.40 = 6,640.80 : x
  2. Step 2: Convert to fraction form
    8,104.20/12,155.40 = 6,640.80/x
  3. Step 3: Cross multiply
    8,104.20x = 12,155.40 × 6,640.80
  4. Step 4: Simplify right side
    8,104.20x = 80,721,580.32
  5. Step 5: Solve for x
    x = 80,721,580.32/8,104.20
  6. Step 6: Final answer
    x = 9,960.46

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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.