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Finding the Fourth Proportional to 620,639.40, 930,959.10 and 221,293.20

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Solution

The fourth proportional to 620,639.40, 930,959.10 and 221,293.20 is: 331,939.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,639.40 : 930,959.10 = 221,293.20 : x
  2. Step 2: Convert to fraction form
    620,639.40/930,959.10 = 221,293.20/x
  3. Step 3: Cross multiply
    620,639.40x = 930,959.10 × 221,293.20
  4. Step 4: Simplify right side
    620,639.40x = 206,014,918,308.12
  5. Step 5: Solve for x
    x = 206,014,918,308.12/620,639.40
  6. Step 6: Final answer
    x = 331,939.80

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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.