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Finding the Fourth Proportional to 665,097.57, 911,187.08 and 640,189.92

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Solution

The fourth proportional to 665,097.57, 911,187.08 and 640,189.92 is: 877,063.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    665,097.57 : 911,187.08 = 640,189.92 : x
  2. Step 2: Convert to fraction form
    665,097.57/911,187.08 = 640,189.92/x
  3. Step 3: Cross multiply
    665,097.57x = 911,187.08 × 640,189.92
  4. Step 4: Simplify right side
    665,097.57x = 583,332,780,649.28
  5. Step 5: Solve for x
    x = 583,332,780,649.28/665,097.57
  6. Step 6: Final answer
    x = 877,063.47

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.