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Finding the Fourth Proportional to 686,625.80, 947,353.52 and 396,217.15

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Solution

The fourth proportional to 686,625.80, 947,353.52 and 396,217.15 is: 546,669.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    686,625.80 : 947,353.52 = 396,217.15 : x
  2. Step 2: Convert to fraction form
    686,625.80/947,353.52 = 396,217.15/x
  3. Step 3: Cross multiply
    686,625.80x = 947,353.52 × 396,217.15
  4. Step 4: Simplify right side
    686,625.80x = 375,357,711,736.87
  5. Step 5: Solve for x
    x = 375,357,711,736.87/686,625.80
  6. Step 6: Final answer
    x = 546,669.98

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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.