Home / 809,345.20-1,214,017.80-431,431.60

Finding the Fourth Proportional to 809,345.20, 1,214,017.80 and 431,431.60

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Solution

The fourth proportional to 809,345.20, 1,214,017.80 and 431,431.60 is: 647,147.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    809,345.20 : 1,214,017.80 = 431,431.60 : x
  2. Step 2: Convert to fraction form
    809,345.20/1,214,017.80 = 431,431.60/x
  3. Step 3: Cross multiply
    809,345.20x = 1,214,017.80 × 431,431.60
  4. Step 4: Simplify right side
    809,345.20x = 523,765,641,882.48
  5. Step 5: Solve for x
    x = 523,765,641,882.48/809,345.20
  6. Step 6: Final answer
    x = 647,147.40

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Double scale
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Similar ratio
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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.