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Finding the Fourth Proportional to 20,105.60, 30,165.60 and 8,422.40

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Solution

The fourth proportional to 20,105.60, 30,165.60 and 8,422.40 is: 12,636.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,105.60 : 30,165.60 = 8,422.40 : x
  2. Step 2: Convert to fraction form
    20,105.60/30,165.60 = 8,422.40/x
  3. Step 3: Cross multiply
    20,105.60x = 30,165.60 × 8,422.40
  4. Step 4: Simplify right side
    20,105.60x = 254,066,749.44
  5. Step 5: Solve for x
    x = 254,066,749.44/20,105.60
  6. Step 6: Final answer
    x = 12,636.62

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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.