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Finding the Fourth Proportional to 639,251.80, 958,877.70 and 440,186.20

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Solution

The fourth proportional to 639,251.80, 958,877.70 and 440,186.20 is: 660,279.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,251.80 : 958,877.70 = 440,186.20 : x
  2. Step 2: Convert to fraction form
    639,251.80/958,877.70 = 440,186.20/x
  3. Step 3: Cross multiply
    639,251.80x = 958,877.70 × 440,186.20
  4. Step 4: Simplify right side
    639,251.80x = 422,084,731,027.74
  5. Step 5: Solve for x
    x = 422,084,731,027.74/639,251.80
  6. Step 6: Final answer
    x = 660,279.30

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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.