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Finding the Fourth Proportional to 71,791.07, 99,071.69 and 39,959.28

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Solution

The fourth proportional to 71,791.07, 99,071.69 and 39,959.28 is: 55,143.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,791.07 : 99,071.69 = 39,959.28 : x
  2. Step 2: Convert to fraction form
    71,791.07/99,071.69 = 39,959.28/x
  3. Step 3: Cross multiply
    71,791.07x = 99,071.69 × 39,959.28
  4. Step 4: Simplify right side
    71,791.07x = 3,958,833,200.99
  5. Step 5: Solve for x
    x = 3,958,833,200.99/71,791.07
  6. Step 6: Final answer
    x = 55,143.81

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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.