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Finding the Fourth Proportional to 718,209.28, 991,131.92 and 395,912.44

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Solution

The fourth proportional to 718,209.28, 991,131.92 and 395,912.44 is: 546,360.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,209.28 : 991,131.92 = 395,912.44 : x
  2. Step 2: Convert to fraction form
    718,209.28/991,131.92 = 395,912.44/x
  3. Step 3: Cross multiply
    718,209.28x = 991,131.92 × 395,912.44
  4. Step 4: Simplify right side
    718,209.28x = 392,401,456,809.09
  5. Step 5: Solve for x
    x = 392,401,456,809.09/718,209.28
  6. Step 6: Final answer
    x = 546,360.88

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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.