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Finding the Fourth Proportional to 638,809.40, 957,047.70 and 519,836.60

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Solution

The fourth proportional to 638,809.40, 957,047.70 and 519,836.60 is: 778,805.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    638,809.40 : 957,047.70 = 519,836.60 : x
  2. Step 2: Convert to fraction form
    638,809.40/957,047.70 = 519,836.60/x
  3. Step 3: Cross multiply
    638,809.40x = 957,047.70 × 519,836.60
  4. Step 4: Simplify right side
    638,809.40x = 497,508,422,405.82
  5. Step 5: Solve for x
    x = 497,508,422,405.82/638,809.40
  6. Step 6: Final answer
    x = 778,805.73

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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.