Home / 20,418.54-30,638.96-7,939.05

Finding the Fourth Proportional to 20,418.54, 30,638.96 and 7,939.05

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Solution

The fourth proportional to 20,418.54, 30,638.96 and 7,939.05 is: 11,912.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,418.54 : 30,638.96 = 7,939.05 : x
  2. Step 2: Convert to fraction form
    20,418.54/30,638.96 = 7,939.05/x
  3. Step 3: Cross multiply
    20,418.54x = 30,638.96 × 7,939.05
  4. Step 4: Simplify right side
    20,418.54x = 243,244,235.39
  5. Step 5: Solve for x
    x = 243,244,235.39/20,418.54
  6. Step 6: Final answer
    x = 11,912.91

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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.