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Finding the Fourth Proportional to 641,406.17, 885,234.39 and 369,421.76

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Solution

The fourth proportional to 641,406.17, 885,234.39 and 369,421.76 is: 509,856.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    641,406.17 : 885,234.39 = 369,421.76 : x
  2. Step 2: Convert to fraction form
    641,406.17/885,234.39 = 369,421.76/x
  3. Step 3: Cross multiply
    641,406.17x = 885,234.39 × 369,421.76
  4. Step 4: Simplify right side
    641,406.17x = 327,024,846,366.33
  5. Step 5: Solve for x
    x = 327,024,846,366.33/641,406.17
  6. Step 6: Final answer
    x = 509,856.10

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Half scale
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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 (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.