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Finding the Fourth Proportional to 426,321.20, 639,481.80 and 408,119.60

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Solution

The fourth proportional to 426,321.20, 639,481.80 and 408,119.60 is: 612,179.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    426,321.20 : 639,481.80 = 408,119.60 : x
  2. Step 2: Convert to fraction form
    426,321.20/639,481.80 = 408,119.60/x
  3. Step 3: Cross multiply
    426,321.20x = 639,481.80 × 408,119.60
  4. Step 4: Simplify right side
    426,321.20x = 260,985,056,423.28
  5. Step 5: Solve for x
    x = 260,985,056,423.28/426,321.20
  6. Step 6: Final answer
    x = 612,179.40

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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.