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Finding the Fourth Proportional to 71,751.46, 99,021.75 and 39,920.43

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Solution

The fourth proportional to 71,751.46, 99,021.75 and 39,920.43 is: 55,092.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,751.46 : 99,021.75 = 39,920.43 : x
  2. Step 2: Convert to fraction form
    71,751.46/99,021.75 = 39,920.43/x
  3. Step 3: Cross multiply
    71,751.46x = 99,021.75 × 39,920.43
  4. Step 4: Simplify right side
    71,751.46x = 3,952,990,839.35
  5. Step 5: Solve for x
    x = 3,952,990,839.35/71,751.46
  6. Step 6: Final answer
    x = 55,092.83

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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.