Home / 20,872.97-31,235.54-12,979.20

Finding the Fourth Proportional to 20,872.97, 31,235.54 and 12,979.20

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Solution

The fourth proportional to 20,872.97, 31,235.54 and 12,979.20 is: 19,422.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,872.97 : 31,235.54 = 12,979.20 : x
  2. Step 2: Convert to fraction form
    20,872.97/31,235.54 = 12,979.20/x
  3. Step 3: Cross multiply
    20,872.97x = 31,235.54 × 12,979.20
  4. Step 4: Simplify right side
    20,872.97x = 405,412,297.95
  5. Step 5: Solve for x
    x = 405,412,297.95/20,872.97
  6. Step 6: Final answer
    x = 19,422.84

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.