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Finding the Fourth Proportional to 420,086.96, 629,940.90 and 120,498.80

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Solution

The fourth proportional to 420,086.96, 629,940.90 and 120,498.80 is: 180,693.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,086.96 : 629,940.90 = 120,498.80 : x
  2. Step 2: Convert to fraction form
    420,086.96/629,940.90 = 120,498.80/x
  3. Step 3: Cross multiply
    420,086.96x = 629,940.90 × 120,498.80
  4. Step 4: Simplify right side
    420,086.96x = 75,907,122,520.92
  5. Step 5: Solve for x
    x = 75,907,122,520.92/420,086.96
  6. Step 6: Final answer
    x = 180,693.83

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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.