Home / 8,120.19-12,150.09-7,128.33

Finding the Fourth Proportional to 8,120.19, 12,150.09 and 7,128.33

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Solution

The fourth proportional to 8,120.19, 12,150.09 and 7,128.33 is: 10,665.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,120.19 : 12,150.09 = 7,128.33 : x
  2. Step 2: Convert to fraction form
    8,120.19/12,150.09 = 7,128.33/x
  3. Step 3: Cross multiply
    8,120.19x = 12,150.09 × 7,128.33
  4. Step 4: Simplify right side
    8,120.19x = 86,609,851.05
  5. Step 5: Solve for x
    x = 86,609,851.05/8,120.19
  6. Step 6: Final answer
    x = 10,665.99

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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.