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Finding the Fourth Proportional to 639,711.76, 959,567.52 and 190,439.20

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Solution

The fourth proportional to 639,711.76, 959,567.52 and 190,439.20 is: 285,658.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,711.76 : 959,567.52 = 190,439.20 : x
  2. Step 2: Convert to fraction form
    639,711.76/959,567.52 = 190,439.20/x
  3. Step 3: Cross multiply
    639,711.76x = 959,567.52 × 190,439.20
  4. Step 4: Simplify right side
    639,711.76x = 182,739,270,854.78
  5. Step 5: Solve for x
    x = 182,739,270,854.78/639,711.76
  6. Step 6: Final answer
    x = 285,658.76

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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.