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Finding the Fourth Proportional to 638,591.40, 956,720.70 and 519,618.60

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Solution

The fourth proportional to 638,591.40, 956,720.70 and 519,618.60 is: 778,478.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    638,591.40 : 956,720.70 = 519,618.60 : x
  2. Step 2: Convert to fraction form
    638,591.40/956,720.70 = 519,618.60/x
  3. Step 3: Cross multiply
    638,591.40x = 956,720.70 × 519,618.60
  4. Step 4: Simplify right side
    638,591.40x = 497,129,870,725.02
  5. Step 5: Solve for x
    x = 497,129,870,725.02/638,591.40
  6. Step 6: Final answer
    x = 778,478.81

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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.