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Finding the Fourth Proportional to 20,165.60, 30,226.80 and 7,680.80

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Solution

The fourth proportional to 20,165.60, 30,226.80 and 7,680.80 is: 11,512.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,165.60 : 30,226.80 = 7,680.80 : x
  2. Step 2: Convert to fraction form
    20,165.60/30,226.80 = 7,680.80/x
  3. Step 3: Cross multiply
    20,165.60x = 30,226.80 × 7,680.80
  4. Step 4: Simplify right side
    20,165.60x = 232,166,005.44
  5. Step 5: Solve for x
    x = 232,166,005.44/20,165.60
  6. Step 6: Final answer
    x = 11,512.97

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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.