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Finding the Fourth Proportional to 99,231.78, 136,940.79 and 53,910.09

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Solution

The fourth proportional to 99,231.78, 136,940.79 and 53,910.09 is: 74,396.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,231.78 : 136,940.79 = 53,910.09 : x
  2. Step 2: Convert to fraction form
    99,231.78/136,940.79 = 53,910.09/x
  3. Step 3: Cross multiply
    99,231.78x = 136,940.79 × 53,910.09
  4. Step 4: Simplify right side
    99,231.78x = 7,382,490,313.57
  5. Step 5: Solve for x
    x = 7,382,490,313.57/99,231.78
  6. Step 6: Final answer
    x = 74,396.43

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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.