Home / 20,845.86-31,261.50-12,936.20

Finding the Fourth Proportional to 20,845.86, 31,261.50 and 12,936.20

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Solution

The fourth proportional to 20,845.86, 31,261.50 and 12,936.20 is: 19,399.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,845.86 : 31,261.50 = 12,936.20 : x
  2. Step 2: Convert to fraction form
    20,845.86/31,261.50 = 12,936.20/x
  3. Step 3: Cross multiply
    20,845.86x = 31,261.50 × 12,936.20
  4. Step 4: Simplify right side
    20,845.86x = 404,405,016.30
  5. Step 5: Solve for x
    x = 404,405,016.30/20,845.86
  6. Step 6: Final answer
    x = 19,399.78

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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.