Home / 3,921.68-5,412.12-2,153.36

Finding the Fourth Proportional to 3,921.68, 5,412.12 and 2,153.36

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Solution

The fourth proportional to 3,921.68, 5,412.12 and 2,153.36 is: 2,971.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,921.68 : 5,412.12 = 2,153.36 : x
  2. Step 2: Convert to fraction form
    3,921.68/5,412.12 = 2,153.36/x
  3. Step 3: Cross multiply
    3,921.68x = 5,412.12 × 2,153.36
  4. Step 4: Simplify right side
    3,921.68x = 11,654,242.72
  5. Step 5: Solve for x
    x = 11,654,242.72/3,921.68
  6. Step 6: Final answer
    x = 2,971.75

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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.