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Finding the Fourth Proportional to 620,543.80, 930,815.70 and 221,197.60

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Solution

The fourth proportional to 620,543.80, 930,815.70 and 221,197.60 is: 331,796.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,543.80 : 930,815.70 = 221,197.60 : x
  2. Step 2: Convert to fraction form
    620,543.80/930,815.70 = 221,197.60/x
  3. Step 3: Cross multiply
    620,543.80x = 930,815.70 × 221,197.60
  4. Step 4: Simplify right side
    620,543.80x = 205,894,198,882.32
  5. Step 5: Solve for x
    x = 205,894,198,882.32/620,543.80
  6. Step 6: Final answer
    x = 331,796.40

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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.