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Finding the Fourth Proportional to 215,891.11, 323,858.27 and 66,129.67

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Solution

The fourth proportional to 215,891.11, 323,858.27 and 66,129.67 is: 99,201.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    215,891.11 : 323,858.27 = 66,129.67 : x
  2. Step 2: Convert to fraction form
    215,891.11/323,858.27 = 66,129.67/x
  3. Step 3: Cross multiply
    215,891.11x = 323,858.27 × 66,129.67
  4. Step 4: Simplify right side
    215,891.11x = 21,416,640,521.87
  5. Step 5: Solve for x
    x = 21,416,640,521.87/215,891.11
  6. Step 6: Final answer
    x = 99,201.12

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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.