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Finding the Fourth Proportional to 81,021.79, 111,809.82 and 45,211.42

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Solution

The fourth proportional to 81,021.79, 111,809.82 and 45,211.42 is: 62,391.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,021.79 : 111,809.82 = 45,211.42 : x
  2. Step 2: Convert to fraction form
    81,021.79/111,809.82 = 45,211.42/x
  3. Step 3: Cross multiply
    81,021.79x = 111,809.82 × 45,211.42
  4. Step 4: Simplify right side
    81,021.79x = 5,055,080,732.14
  5. Step 5: Solve for x
    x = 5,055,080,732.14/81,021.79
  6. Step 6: Final answer
    x = 62,391.62

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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.