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Finding the Fourth Proportional to 81,231.66, 111,850.47 and 71,103.42

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Solution

The fourth proportional to 81,231.66, 111,850.47 and 71,103.42 is: 97,904.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,231.66 : 111,850.47 = 71,103.42 : x
  2. Step 2: Convert to fraction form
    81,231.66/111,850.47 = 71,103.42/x
  3. Step 3: Cross multiply
    81,231.66x = 111,850.47 × 71,103.42
  4. Step 4: Simplify right side
    81,231.66x = 7,952,950,945.61
  5. Step 5: Solve for x
    x = 7,952,950,945.61/81,231.66
  6. Step 6: Final answer
    x = 97,904.57

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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.