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Finding the Fourth Proportional to 513,906.80, 770,860.20 and 419,428.40

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Solution

The fourth proportional to 513,906.80, 770,860.20 and 419,428.40 is: 629,142.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    513,906.80 : 770,860.20 = 419,428.40 : x
  2. Step 2: Convert to fraction form
    513,906.80/770,860.20 = 419,428.40/x
  3. Step 3: Cross multiply
    513,906.80x = 770,860.20 × 419,428.40
  4. Step 4: Simplify right side
    513,906.80x = 323,320,660,309.68
  5. Step 5: Solve for x
    x = 323,320,660,309.68/513,906.80
  6. Step 6: Final answer
    x = 629,142.60

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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.