Home / 20,478.96-30,712.89-8,789.44

Finding the Fourth Proportional to 20,478.96, 30,712.89 and 8,789.44

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Solution

The fourth proportional to 20,478.96, 30,712.89 and 8,789.44 is: 13,181.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,478.96 : 30,712.89 = 8,789.44 : x
  2. Step 2: Convert to fraction form
    20,478.96/30,712.89 = 8,789.44/x
  3. Step 3: Cross multiply
    20,478.96x = 30,712.89 × 8,789.44
  4. Step 4: Simplify right side
    20,478.96x = 269,949,103.88
  5. Step 5: Solve for x
    x = 269,949,103.88/20,478.96
  6. Step 6: Final answer
    x = 13,181.78

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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.