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Finding the Fourth Proportional to 80,422.60, 120,633.15 and 20,451.21

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Solution

The fourth proportional to 80,422.60, 120,633.15 and 20,451.21 is: 30,676.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,422.60 : 120,633.15 = 20,451.21 : x
  2. Step 2: Convert to fraction form
    80,422.60/120,633.15 = 20,451.21/x
  3. Step 3: Cross multiply
    80,422.60x = 120,633.15 × 20,451.21
  4. Step 4: Simplify right side
    80,422.60x = 2,467,093,883.61
  5. Step 5: Solve for x
    x = 2,467,093,883.61/80,422.60
  6. Step 6: Final answer
    x = 30,676.62

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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.