Home / 3,896.89-5,377.80-2,128.66

Finding the Fourth Proportional to 3,896.89, 5,377.80 and 2,128.66

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Solution

The fourth proportional to 3,896.89, 5,377.80 and 2,128.66 is: 2,937.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,896.89 : 5,377.80 = 2,128.66 : x
  2. Step 2: Convert to fraction form
    3,896.89/5,377.80 = 2,128.66/x
  3. Step 3: Cross multiply
    3,896.89x = 5,377.80 × 2,128.66
  4. Step 4: Simplify right side
    3,896.89x = 11,447,507.75
  5. Step 5: Solve for x
    x = 11,447,507.75/3,896.89
  6. Step 6: Final answer
    x = 2,937.60

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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.