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Finding the Fourth Proportional to 621,203.80, 931,805.70 and 221,857.60

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Solution

The fourth proportional to 621,203.80, 931,805.70 and 221,857.60 is: 332,786.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    621,203.80 : 931,805.70 = 221,857.60 : x
  2. Step 2: Convert to fraction form
    621,203.80/931,805.70 = 221,857.60/x
  3. Step 3: Cross multiply
    621,203.80x = 931,805.70 × 221,857.60
  4. Step 4: Simplify right side
    621,203.80x = 206,728,176,268.32
  5. Step 5: Solve for x
    x = 206,728,176,268.32/621,203.80
  6. Step 6: Final answer
    x = 332,786.40

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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.