Home / 12,138.30-18,198.45-3,813.57

Finding the Fourth Proportional to 12,138.30, 18,198.45 and 3,813.57

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Solution

The fourth proportional to 12,138.30, 18,198.45 and 3,813.57 is: 5,717.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,138.30 : 18,198.45 = 3,813.57 : x
  2. Step 2: Convert to fraction form
    12,138.30/18,198.45 = 3,813.57/x
  3. Step 3: Cross multiply
    12,138.30x = 18,198.45 × 3,813.57
  4. Step 4: Simplify right side
    12,138.30x = 69,401,062.97
  5. Step 5: Solve for x
    x = 69,401,062.97/12,138.30
  6. Step 6: Final answer
    x = 5,717.53

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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.