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Finding the Fourth Proportional to 419,910.80, 629,866.20 and 285,191.60

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Solution

The fourth proportional to 419,910.80, 629,866.20 and 285,191.60 is: 427,787.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    419,910.80 : 629,866.20 = 285,191.60 : x
  2. Step 2: Convert to fraction form
    419,910.80/629,866.20 = 285,191.60/x
  3. Step 3: Cross multiply
    419,910.80x = 629,866.20 × 285,191.60
  4. Step 4: Simplify right side
    419,910.80x = 179,632,549,363.92
  5. Step 5: Solve for x
    x = 179,632,549,363.92/419,910.80
  6. Step 6: Final answer
    x = 427,787.40

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Similar ratio
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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.