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Finding the Fourth Proportional to 71,791.69, 99,072.54 and 39,959.91

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Solution

The fourth proportional to 71,791.69, 99,072.54 and 39,959.91 is: 55,144.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,791.69 : 99,072.54 = 39,959.91 : x
  2. Step 2: Convert to fraction form
    71,791.69/99,072.54 = 39,959.91/x
  3. Step 3: Cross multiply
    71,791.69x = 99,072.54 × 39,959.91
  4. Step 4: Simplify right side
    71,791.69x = 3,958,929,086.71
  5. Step 5: Solve for x
    x = 3,958,929,086.71/71,791.69
  6. Step 6: Final answer
    x = 55,144.67

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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.