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Finding the Fourth Proportional to 215,920.92, 323,869.71 and 66,161.64

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Solution

The fourth proportional to 215,920.92, 323,869.71 and 66,161.64 is: 99,238.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    215,920.92 : 323,869.71 = 66,161.64 : x
  2. Step 2: Convert to fraction form
    215,920.92/323,869.71 = 66,161.64/x
  3. Step 3: Cross multiply
    215,920.92x = 323,869.71 × 66,161.64
  4. Step 4: Simplify right side
    215,920.92x = 21,427,752,250.38
  5. Step 5: Solve for x
    x = 21,427,752,250.38/215,920.92
  6. Step 6: Final answer
    x = 99,238.89

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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.