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Finding the Fourth Proportional to 215,991.45, 323,975.07 and 66,231.33

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Solution

The fourth proportional to 215,991.45, 323,975.07 and 66,231.33 is: 99,343.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    215,991.45 : 323,975.07 = 66,231.33 : x
  2. Step 2: Convert to fraction form
    215,991.45/323,975.07 = 66,231.33/x
  3. Step 3: Cross multiply
    215,991.45x = 323,975.07 × 66,231.33
  4. Step 4: Simplify right side
    215,991.45x = 21,457,299,772.94
  5. Step 5: Solve for x
    x = 21,457,299,772.94/215,991.45
  6. Step 6: Final answer
    x = 99,343.28

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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.