Home / 8,085.80-12,120.30-3,919.64

Finding the Fourth Proportional to 8,085.80, 12,120.30 and 3,919.64

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Solution

The fourth proportional to 8,085.80, 12,120.30 and 3,919.64 is: 5,875.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,085.80 : 12,120.30 = 3,919.64 : x
  2. Step 2: Convert to fraction form
    8,085.80/12,120.30 = 3,919.64/x
  3. Step 3: Cross multiply
    8,085.80x = 12,120.30 × 3,919.64
  4. Step 4: Simplify right side
    8,085.80x = 47,507,212.69
  5. Step 5: Solve for x
    x = 47,507,212.69/8,085.80
  6. Step 6: Final answer
    x = 5,875.39

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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.