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Finding the Fourth Proportional to 640,406.66, 958,617.08 and 403,251.11

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Solution

The fourth proportional to 640,406.66, 958,617.08 and 403,251.11 is: 603,621.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,406.66 : 958,617.08 = 403,251.11 : x
  2. Step 2: Convert to fraction form
    640,406.66/958,617.08 = 403,251.11/x
  3. Step 3: Cross multiply
    640,406.66x = 958,617.08 × 403,251.11
  4. Step 4: Simplify right side
    640,406.66x = 386,563,399,872.62
  5. Step 5: Solve for x
    x = 386,563,399,872.62/640,406.66
  6. Step 6: Final answer
    x = 603,621.77

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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.