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Finding the Fourth Proportional to 647,939.20, 971,908.80 and 411,451.60

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Solution

The fourth proportional to 647,939.20, 971,908.80 and 411,451.60 is: 617,177.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    647,939.20 : 971,908.80 = 411,451.60 : x
  2. Step 2: Convert to fraction form
    647,939.20/971,908.80 = 411,451.60/x
  3. Step 3: Cross multiply
    647,939.20x = 971,908.80 × 411,451.60
  4. Step 4: Simplify right side
    647,939.20x = 399,893,430,814.08
  5. Step 5: Solve for x
    x = 399,893,430,814.08/647,939.20
  6. Step 6: Final answer
    x = 617,177.40

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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.