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Finding the Fourth Proportional to 71,620.42, 98,838.42 and 39,791.86

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Solution

The fourth proportional to 71,620.42, 98,838.42 and 39,791.86 is: 54,914.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,620.42 : 98,838.42 = 39,791.86 : x
  2. Step 2: Convert to fraction form
    71,620.42/98,838.42 = 39,791.86/x
  3. Step 3: Cross multiply
    71,620.42x = 98,838.42 × 39,791.86
  4. Step 4: Simplify right side
    71,620.42x = 3,932,964,571.26
  5. Step 5: Solve for x
    x = 3,932,964,571.26/71,620.42
  6. Step 6: Final answer
    x = 54,914.01

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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.