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Finding the Fourth Proportional to 717,067.68, 989,534.19 and 394,780.20

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Solution

The fourth proportional to 717,067.68, 989,534.19 and 394,780.20 is: 544,786.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    717,067.68 : 989,534.19 = 394,780.20 : x
  2. Step 2: Convert to fraction form
    717,067.68/989,534.19 = 394,780.20/x
  3. Step 3: Cross multiply
    717,067.68x = 989,534.19 × 394,780.20
  4. Step 4: Simplify right side
    717,067.68x = 390,648,505,435.04
  5. Step 5: Solve for x
    x = 390,648,505,435.04/717,067.68
  6. Step 6: Final answer
    x = 544,786.10

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Double scale
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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.