Home / 20,790.36-31,203.12-8,319.12

Finding the Fourth Proportional to 20,790.36, 31,203.12 and 8,319.12

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Solution

The fourth proportional to 20,790.36, 31,203.12 and 8,319.12 is: 12,485.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,790.36 : 31,203.12 = 8,319.12 : x
  2. Step 2: Convert to fraction form
    20,790.36/31,203.12 = 8,319.12/x
  3. Step 3: Cross multiply
    20,790.36x = 31,203.12 × 8,319.12
  4. Step 4: Simplify right side
    20,790.36x = 259,582,499.65
  5. Step 5: Solve for x
    x = 259,582,499.65/20,790.36
  6. Step 6: Final answer
    x = 12,485.71

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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.