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Finding the Fourth Proportional to 621,420, 931,752.63 and 405,439.17

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Solution

The fourth proportional to 621,420, 931,752.63 and 405,439.17 is: 607,912.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    621,420 : 931,752.63 = 405,439.17 : x
  2. Step 2: Convert to fraction form
    621,420/931,752.63 = 405,439.17/x
  3. Step 3: Cross multiply
    621,420x = 931,752.63 × 405,439.17
  4. Step 4: Simplify right side
    621,420x = 377,769,012,952.52
  5. Step 5: Solve for x
    x = 377,769,012,952.52/621,420
  6. Step 6: Final answer
    x = 607,912.54

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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.