Home / 3,921.75-5,412.11-2,153.39

Finding the Fourth Proportional to 3,921.75, 5,412.11 and 2,153.39

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Solution

The fourth proportional to 3,921.75, 5,412.11 and 2,153.39 is: 2,971.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,921.75 : 5,412.11 = 2,153.39 : x
  2. Step 2: Convert to fraction form
    3,921.75/5,412.11 = 2,153.39/x
  3. Step 3: Cross multiply
    3,921.75x = 5,412.11 × 2,153.39
  4. Step 4: Simplify right side
    3,921.75x = 11,654,345.73
  5. Step 5: Solve for x
    x = 11,654,345.73/3,921.75
  6. Step 6: Final answer
    x = 2,971.72

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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.