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Finding the Fourth Proportional to 71,791.64, 99,070.26 and 39,959.72

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Solution

The fourth proportional to 71,791.64, 99,070.26 and 39,959.72 is: 55,143.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,791.64 : 99,070.26 = 39,959.72 : x
  2. Step 2: Convert to fraction form
    71,791.64/99,070.26 = 39,959.72/x
  3. Step 3: Cross multiply
    71,791.64x = 99,070.26 × 39,959.72
  4. Step 4: Simplify right side
    71,791.64x = 3,958,819,849.93
  5. Step 5: Solve for x
    x = 3,958,819,849.93/71,791.64
  6. Step 6: Final answer
    x = 55,143.19

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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.