Home / 20,921.97-28,872.22-11,361.79

Finding the Fourth Proportional to 20,921.97, 28,872.22 and 11,361.79

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Solution

The fourth proportional to 20,921.97, 28,872.22 and 11,361.79 is: 15,679.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,921.97 : 28,872.22 = 11,361.79 : x
  2. Step 2: Convert to fraction form
    20,921.97/28,872.22 = 11,361.79/x
  3. Step 3: Cross multiply
    20,921.97x = 28,872.22 × 11,361.79
  4. Step 4: Simplify right side
    20,921.97x = 328,040,000.39
  5. Step 5: Solve for x
    x = 328,040,000.39/20,921.97
  6. Step 6: Final answer
    x = 15,679.22

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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.