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Finding the Fourth Proportional to 621,638.06, 857,910.32 and 349,689.74

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Solution

The fourth proportional to 621,638.06, 857,910.32 and 349,689.74 is: 482,599.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    621,638.06 : 857,910.32 = 349,689.74 : x
  2. Step 2: Convert to fraction form
    621,638.06/857,910.32 = 349,689.74/x
  3. Step 3: Cross multiply
    621,638.06x = 857,910.32 × 349,689.74
  4. Step 4: Simplify right side
    621,638.06x = 300,002,436,744.12
  5. Step 5: Solve for x
    x = 300,002,436,744.12/621,638.06
  6. Step 6: Final answer
    x = 482,599.85

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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.