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Finding the Fourth Proportional to 442,978.80, 664,662.60 and 206,199.60

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Solution

The fourth proportional to 442,978.80, 664,662.60 and 206,199.60 is: 309,389.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    442,978.80 : 664,662.60 = 206,199.60 : x
  2. Step 2: Convert to fraction form
    442,978.80/664,662.60 = 206,199.60/x
  3. Step 3: Cross multiply
    442,978.80x = 664,662.60 × 206,199.60
  4. Step 4: Simplify right side
    442,978.80x = 137,053,162,254.96
  5. Step 5: Solve for x
    x = 137,053,162,254.96/442,978.80
  6. Step 6: Final answer
    x = 309,389.89

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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.