Home / 12,120.75-18,181.13-3,912.75

Finding the Fourth Proportional to 12,120.75, 18,181.13 and 3,912.75

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Solution

The fourth proportional to 12,120.75, 18,181.13 and 3,912.75 is: 5,869.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,120.75 : 18,181.13 = 3,912.75 : x
  2. Step 2: Convert to fraction form
    12,120.75/18,181.13 = 3,912.75/x
  3. Step 3: Cross multiply
    12,120.75x = 18,181.13 × 3,912.75
  4. Step 4: Simplify right side
    12,120.75x = 71,138,196.84
  5. Step 5: Solve for x
    x = 71,138,196.84/12,120.75
  6. Step 6: Final answer
    x = 5,869.13

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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.