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Finding the Fourth Proportional to 426,999.91, 640,511.20 and 186,989.82

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Solution

The fourth proportional to 426,999.91, 640,511.20 and 186,989.82 is: 280,489.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    426,999.91 : 640,511.20 = 186,989.82 : x
  2. Step 2: Convert to fraction form
    426,999.91/640,511.20 = 186,989.82/x
  3. Step 3: Cross multiply
    426,999.91x = 640,511.20 × 186,989.82
  4. Step 4: Simplify right side
    426,999.91x = 119,769,073,995.98
  5. Step 5: Solve for x
    x = 119,769,073,995.98/426,999.91
  6. Step 6: Final answer
    x = 280,489.70

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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.