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Finding the Fourth Proportional to 698,921.28, 964,591.68 and 388,854.72

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Solution

The fourth proportional to 698,921.28, 964,591.68 and 388,854.72 is: 536,664.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    698,921.28 : 964,591.68 = 388,854.72 : x
  2. Step 2: Convert to fraction form
    698,921.28/964,591.68 = 388,854.72/x
  3. Step 3: Cross multiply
    698,921.28x = 964,591.68 × 388,854.72
  4. Step 4: Simplify right side
    698,921.28x = 375,086,027,640.73
  5. Step 5: Solve for x
    x = 375,086,027,640.73/698,921.28
  6. Step 6: Final answer
    x = 536,664.20

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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.