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Finding the Fourth Proportional to 639,443.87, 958,958.19 and 212,865.11

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Solution

The fourth proportional to 639,443.87, 958,958.19 and 212,865.11 is: 319,228.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,443.87 : 958,958.19 = 212,865.11 : x
  2. Step 2: Convert to fraction form
    639,443.87/958,958.19 = 212,865.11/x
  3. Step 3: Cross multiply
    639,443.87x = 958,958.19 × 212,865.11
  4. Step 4: Simplify right side
    639,443.87x = 204,128,744,795.19
  5. Step 5: Solve for x
    x = 204,128,744,795.19/639,443.87
  6. Step 6: Final answer
    x = 319,228.56

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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.