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Finding the Fourth Proportional to 647,240.80, 970,861.20 and 619,938.40

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Solution

The fourth proportional to 647,240.80, 970,861.20 and 619,938.40 is: 929,907.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    647,240.80 : 970,861.20 = 619,938.40 : x
  2. Step 2: Convert to fraction form
    647,240.80/970,861.20 = 619,938.40/x
  3. Step 3: Cross multiply
    647,240.80x = 970,861.20 × 619,938.40
  4. Step 4: Simplify right side
    647,240.80x = 601,874,138,950.08
  5. Step 5: Solve for x
    x = 601,874,138,950.08/647,240.80
  6. Step 6: Final answer
    x = 929,907.60

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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.