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Finding the Fourth Proportional to 215,921.92, 323,871.21 and 66,162.64

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Solution

The fourth proportional to 215,921.92, 323,871.21 and 66,162.64 is: 99,240.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    215,921.92 : 323,871.21 = 66,162.64 : x
  2. Step 2: Convert to fraction form
    215,921.92/323,871.21 = 66,162.64/x
  3. Step 3: Cross multiply
    215,921.92x = 323,871.21 × 66,162.64
  4. Step 4: Simplify right side
    215,921.92x = 21,428,174,273.59
  5. Step 5: Solve for x
    x = 21,428,174,273.59/215,921.92
  6. Step 6: Final answer
    x = 99,240.38

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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.