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Finding the Fourth Proportional to 620,657.80, 930,986.70 and 221,311.60

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Solution

The fourth proportional to 620,657.80, 930,986.70 and 221,311.60 is: 331,967.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,657.80 : 930,986.70 = 221,311.60 : x
  2. Step 2: Convert to fraction form
    620,657.80/930,986.70 = 221,311.60/x
  3. Step 3: Cross multiply
    620,657.80x = 930,986.70 × 221,311.60
  4. Step 4: Simplify right side
    620,657.80x = 206,038,156,155.72
  5. Step 5: Solve for x
    x = 206,038,156,155.72/620,657.80
  6. Step 6: Final answer
    x = 331,967.40

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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.