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Finding the Fourth Proportional to 811,591.11, 1,120,354.47 and 485,019.36

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Solution

The fourth proportional to 811,591.11, 1,120,354.47 and 485,019.36 is: 669,541.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    811,591.11 : 1,120,354.47 = 485,019.36 : x
  2. Step 2: Convert to fraction form
    811,591.11/1,120,354.47 = 485,019.36/x
  3. Step 3: Cross multiply
    811,591.11x = 1,120,354.47 × 485,019.36
  4. Step 4: Simplify right side
    811,591.11x = 543,393,608,012.54
  5. Step 5: Solve for x
    x = 543,393,608,012.54/811,591.11
  6. Step 6: Final answer
    x = 669,541.10

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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.