Home / 2,121.38-3,181.86-1,299.23

Finding the Fourth Proportional to 2,121.38, 3,181.86 and 1,299.23

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Solution

The fourth proportional to 2,121.38, 3,181.86 and 1,299.23 is: 1,948.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,121.38 : 3,181.86 = 1,299.23 : x
  2. Step 2: Convert to fraction form
    2,121.38/3,181.86 = 1,299.23/x
  3. Step 3: Cross multiply
    2,121.38x = 3,181.86 × 1,299.23
  4. Step 4: Simplify right side
    2,121.38x = 4,133,945.56
  5. Step 5: Solve for x
    x = 4,133,945.56/2,121.38
  6. Step 6: Final answer
    x = 1,948.71

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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.