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Finding the Fourth Proportional to 639,376.20, 959,582.70 and 618,640.20

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Solution

The fourth proportional to 639,376.20, 959,582.70 and 618,640.20 is: 928,461.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,376.20 : 959,582.70 = 618,640.20 : x
  2. Step 2: Convert to fraction form
    639,376.20/959,582.70 = 618,640.20/x
  3. Step 3: Cross multiply
    639,376.20x = 959,582.70 × 618,640.20
  4. Step 4: Simplify right side
    639,376.20x = 593,636,433,444.54
  5. Step 5: Solve for x
    x = 593,636,433,444.54/639,376.20
  6. Step 6: Final answer
    x = 928,461.89

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Double scale
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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.