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Finding the Fourth Proportional to 81,235.66, 111,855.99 and 71,107.42

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Solution

The fourth proportional to 81,235.66, 111,855.99 and 71,107.42 is: 97,910.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,235.66 : 111,855.99 = 71,107.42 : x
  2. Step 2: Convert to fraction form
    81,235.66/111,855.99 = 71,107.42/x
  3. Step 3: Cross multiply
    81,235.66x = 111,855.99 × 71,107.42
  4. Step 4: Simplify right side
    81,235.66x = 7,953,790,860.45
  5. Step 5: Solve for x
    x = 7,953,790,860.45/81,235.66
  6. Step 6: Final answer
    x = 97,910.09

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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.