Home / 3,896.65-5,377.21-2,128.24

Finding the Fourth Proportional to 3,896.65, 5,377.21 and 2,128.24

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Solution

The fourth proportional to 3,896.65, 5,377.21 and 2,128.24 is: 2,936.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,896.65 : 5,377.21 = 2,128.24 : x
  2. Step 2: Convert to fraction form
    3,896.65/5,377.21 = 2,128.24/x
  3. Step 3: Cross multiply
    3,896.65x = 5,377.21 × 2,128.24
  4. Step 4: Simplify right side
    3,896.65x = 11,443,993.41
  5. Step 5: Solve for x
    x = 11,443,993.41/3,896.65
  6. Step 6: Final answer
    x = 2,936.88

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.