Home / 8,100.78-12,161.21-5,318.75

Finding the Fourth Proportional to 8,100.78, 12,161.21 and 5,318.75

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Solution

The fourth proportional to 8,100.78, 12,161.21 and 5,318.75 is: 7,984.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,100.78 : 12,161.21 = 5,318.75 : x
  2. Step 2: Convert to fraction form
    8,100.78/12,161.21 = 5,318.75/x
  3. Step 3: Cross multiply
    8,100.78x = 12,161.21 × 5,318.75
  4. Step 4: Simplify right side
    8,100.78x = 64,682,348.29
  5. Step 5: Solve for x
    x = 64,682,348.29/8,100.78
  6. Step 6: Final answer
    x = 7,984.71

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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.