Home / 20,919.22-31,380.27-8,439.35

Finding the Fourth Proportional to 20,919.22, 31,380.27 and 8,439.35

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Solution

The fourth proportional to 20,919.22, 31,380.27 and 8,439.35 is: 12,659.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,919.22 : 31,380.27 = 8,439.35 : x
  2. Step 2: Convert to fraction form
    20,919.22/31,380.27 = 8,439.35/x
  3. Step 3: Cross multiply
    20,919.22x = 31,380.27 × 8,439.35
  4. Step 4: Simplify right side
    20,919.22x = 264,829,081.62
  5. Step 5: Solve for x
    x = 264,829,081.62/20,919.22
  6. Step 6: Final answer
    x = 12,659.61

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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.