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Finding the Fourth Proportional to 426,179.20, 639,268.80 and 419,180.80

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Solution

The fourth proportional to 426,179.20, 639,268.80 and 419,180.80 is: 628,771.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    426,179.20 : 639,268.80 = 419,180.80 : x
  2. Step 2: Convert to fraction form
    426,179.20/639,268.80 = 419,180.80/x
  3. Step 3: Cross multiply
    426,179.20x = 639,268.80 × 419,180.80
  4. Step 4: Simplify right side
    426,179.20x = 267,969,206,999.04
  5. Step 5: Solve for x
    x = 267,969,206,999.04/426,179.20
  6. Step 6: Final answer
    x = 628,771.20

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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.