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Finding the Fourth Proportional to 639,187.80, 958,781.70 and 628,690.20

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Solution

The fourth proportional to 639,187.80, 958,781.70 and 628,690.20 is: 943,035.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,187.80 : 958,781.70 = 628,690.20 : x
  2. Step 2: Convert to fraction form
    639,187.80/958,781.70 = 628,690.20/x
  3. Step 3: Cross multiply
    639,187.80x = 958,781.70 × 628,690.20
  4. Step 4: Simplify right side
    639,187.80x = 602,776,658,729.34
  5. Step 5: Solve for x
    x = 602,776,658,729.34/639,187.80
  6. Step 6: Final answer
    x = 943,035.30

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Similar ratio
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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.