Home / 20,621.72-30,907.26-8,129.22

Finding the Fourth Proportional to 20,621.72, 30,907.26 and 8,129.22

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Solution

The fourth proportional to 20,621.72, 30,907.26 and 8,129.22 is: 12,183.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,621.72 : 30,907.26 = 8,129.22 : x
  2. Step 2: Convert to fraction form
    20,621.72/30,907.26 = 8,129.22/x
  3. Step 3: Cross multiply
    20,621.72x = 30,907.26 × 8,129.22
  4. Step 4: Simplify right side
    20,621.72x = 251,251,916.14
  5. Step 5: Solve for x
    x = 251,251,916.14/20,621.72
  6. Step 6: Final answer
    x = 12,183.85

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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.