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Finding the Fourth Proportional to 641,790.90, 885,393.32 and 387,000.54

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Solution

The fourth proportional to 641,790.90, 885,393.32 and 387,000.54 is: 533,893.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    641,790.90 : 885,393.32 = 387,000.54 : x
  2. Step 2: Convert to fraction form
    641,790.90/885,393.32 = 387,000.54/x
  3. Step 3: Cross multiply
    641,790.90x = 885,393.32 × 387,000.54
  4. Step 4: Simplify right side
    641,790.90x = 342,647,691,017.39
  5. Step 5: Solve for x
    x = 342,647,691,017.39/641,790.90
  6. Step 6: Final answer
    x = 533,893.03

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.