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Finding the Fourth Proportional to 8,085.78, 12,128.22 and 3,403.80

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Solution

The fourth proportional to 8,085.78, 12,128.22 and 3,403.80 is: 5,105.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,085.78 : 12,128.22 = 3,403.80 : x
  2. Step 2: Convert to fraction form
    8,085.78/12,128.22 = 3,403.80/x
  3. Step 3: Cross multiply
    8,085.78x = 12,128.22 × 3,403.80
  4. Step 4: Simplify right side
    8,085.78x = 41,282,035.24
  5. Step 5: Solve for x
    x = 41,282,035.24/8,085.78
  6. Step 6: Final answer
    x = 5,105.51

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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.