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Finding the Fourth Proportional to 720,591.96, 994,420.92 and 393,905.52

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Solution

The fourth proportional to 720,591.96, 994,420.92 and 393,905.52 is: 543,591.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,591.96 : 994,420.92 = 393,905.52 : x
  2. Step 2: Convert to fraction form
    720,591.96/994,420.92 = 393,905.52/x
  3. Step 3: Cross multiply
    720,591.96x = 994,420.92 × 393,905.52
  4. Step 4: Simplify right side
    720,591.96x = 391,707,889,591.48
  5. Step 5: Solve for x
    x = 391,707,889,591.48/720,591.96
  6. Step 6: Final answer
    x = 543,591.81

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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.