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Finding the Fourth Proportional to 800,390.40, 1,200,196.80 and 445,027.20

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Solution

The fourth proportional to 800,390.40, 1,200,196.80 and 445,027.20 is: 667,324.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    800,390.40 : 1,200,196.80 = 445,027.20 : x
  2. Step 2: Convert to fraction form
    800,390.40/1,200,196.80 = 445,027.20/x
  3. Step 3: Cross multiply
    800,390.40x = 1,200,196.80 × 445,027.20
  4. Step 4: Simplify right side
    800,390.40x = 534,120,221,352.96
  5. Step 5: Solve for x
    x = 534,120,221,352.96/800,390.40
  6. Step 6: Final answer
    x = 667,324.62

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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.