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Finding the Fourth Proportional to 639,012.80, 958,519.20 and 534,036.80

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Solution

The fourth proportional to 639,012.80, 958,519.20 and 534,036.80 is: 801,055.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,012.80 : 958,519.20 = 534,036.80 : x
  2. Step 2: Convert to fraction form
    639,012.80/958,519.20 = 534,036.80/x
  3. Step 3: Cross multiply
    639,012.80x = 958,519.20 × 534,036.80
  4. Step 4: Simplify right side
    639,012.80x = 511,884,526,306.56
  5. Step 5: Solve for x
    x = 511,884,526,306.56/639,012.80
  6. Step 6: Final answer
    x = 801,055.20

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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.