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Finding the Fourth Proportional to 621,217.81, 855,164.95 and 459,768.61

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Solution

The fourth proportional to 621,217.81, 855,164.95 and 459,768.61 is: 632,914.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    621,217.81 : 855,164.95 = 459,768.61 : x
  2. Step 2: Convert to fraction form
    621,217.81/855,164.95 = 459,768.61/x
  3. Step 3: Cross multiply
    621,217.81x = 855,164.95 × 459,768.61
  4. Step 4: Simplify right side
    621,217.81x = 393,178,000,382.22
  5. Step 5: Solve for x
    x = 393,178,000,382.22/621,217.81
  6. Step 6: Final answer
    x = 632,914.89

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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.