Home / 8,128.87-12,187.41-5,489.84

Finding the Fourth Proportional to 8,128.87, 12,187.41 and 5,489.84

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Solution

The fourth proportional to 8,128.87, 12,187.41 and 5,489.84 is: 8,230.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,128.87 : 12,187.41 = 5,489.84 : x
  2. Step 2: Convert to fraction form
    8,128.87/12,187.41 = 5,489.84/x
  3. Step 3: Cross multiply
    8,128.87x = 12,187.41 × 5,489.84
  4. Step 4: Simplify right side
    8,128.87x = 66,906,971.68
  5. Step 5: Solve for x
    x = 66,906,971.68/8,128.87
  6. Step 6: Final answer
    x = 8,230.78

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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.