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Finding the Fourth Proportional to 394,009.71, 543,730.64 and 215,161.71

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Solution

The fourth proportional to 394,009.71, 543,730.64 and 215,161.71 is: 296,921.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    394,009.71 : 543,730.64 = 215,161.71 : x
  2. Step 2: Convert to fraction form
    394,009.71/543,730.64 = 215,161.71/x
  3. Step 3: Cross multiply
    394,009.71x = 543,730.64 × 215,161.71
  4. Step 4: Simplify right side
    394,009.71x = 116,990,013,205.99
  5. Step 5: Solve for x
    x = 116,990,013,205.99/394,009.71
  6. Step 6: Final answer
    x = 296,921.65

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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.