Home / 20,857.94-31,305.14-12,080.78

Finding the Fourth Proportional to 20,857.94, 31,305.14 and 12,080.78

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Solution

The fourth proportional to 20,857.94, 31,305.14 and 12,080.78 is: 18,131.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,857.94 : 31,305.14 = 12,080.78 : x
  2. Step 2: Convert to fraction form
    20,857.94/31,305.14 = 12,080.78/x
  3. Step 3: Cross multiply
    20,857.94x = 31,305.14 × 12,080.78
  4. Step 4: Simplify right side
    20,857.94x = 378,190,448.81
  5. Step 5: Solve for x
    x = 378,190,448.81/20,857.94
  6. Step 6: Final answer
    x = 18,131.73

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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.