Home / 3,896.76-5,377.56-2,128.36

Finding the Fourth Proportional to 3,896.76, 5,377.56 and 2,128.36

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Solution

The fourth proportional to 3,896.76, 5,377.56 and 2,128.36 is: 2,937.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,896.76 : 5,377.56 = 2,128.36 : x
  2. Step 2: Convert to fraction form
    3,896.76/5,377.56 = 2,128.36/x
  3. Step 3: Cross multiply
    3,896.76x = 5,377.56 × 2,128.36
  4. Step 4: Simplify right side
    3,896.76x = 11,445,383.60
  5. Step 5: Solve for x
    x = 11,445,383.60/3,896.76
  6. Step 6: Final answer
    x = 2,937.15

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Half scale
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Double scale
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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.