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Finding the Fourth Proportional to 620,651.40, 930,977.10 and 221,305.20

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Solution

The fourth proportional to 620,651.40, 930,977.10 and 221,305.20 is: 331,957.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,651.40 : 930,977.10 = 221,305.20 : x
  2. Step 2: Convert to fraction form
    620,651.40/930,977.10 = 221,305.20/x
  3. Step 3: Cross multiply
    620,651.40x = 930,977.10 × 221,305.20
  4. Step 4: Simplify right side
    620,651.40x = 206,030,073,310.92
  5. Step 5: Solve for x
    x = 206,030,073,310.92/620,651.40
  6. Step 6: Final answer
    x = 331,957.80

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Half scale
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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.