Home / 20,912.22-31,383.45-12,138.30

Finding the Fourth Proportional to 20,912.22, 31,383.45 and 12,138.30

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Solution

The fourth proportional to 20,912.22, 31,383.45 and 12,138.30 is: 18,216.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,912.22 : 31,383.45 = 12,138.30 : x
  2. Step 2: Convert to fraction form
    20,912.22/31,383.45 = 12,138.30/x
  3. Step 3: Cross multiply
    20,912.22x = 31,383.45 × 12,138.30
  4. Step 4: Simplify right side
    20,912.22x = 380,941,731.14
  5. Step 5: Solve for x
    x = 380,941,731.14/20,912.22
  6. Step 6: Final answer
    x = 18,216.23

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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.