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Finding the Fourth Proportional to 408,069.20, 612,190.20 and 123,736.40

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Solution

The fourth proportional to 408,069.20, 612,190.20 and 123,736.40 is: 185,630.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    408,069.20 : 612,190.20 = 123,736.40 : x
  2. Step 2: Convert to fraction form
    408,069.20/612,190.20 = 123,736.40/x
  3. Step 3: Cross multiply
    408,069.20x = 612,190.20 × 123,736.40
  4. Step 4: Simplify right side
    408,069.20x = 75,750,211,463.28
  5. Step 5: Solve for x
    x = 75,750,211,463.28/408,069.20
  6. Step 6: Final answer
    x = 185,630.80

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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.