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Finding the Fourth Proportional to 71,710.89, 98,959.62 and 39,879.09

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Solution

The fourth proportional to 71,710.89, 98,959.62 and 39,879.09 is: 55,032.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,710.89 : 98,959.62 = 39,879.09 : x
  2. Step 2: Convert to fraction form
    71,710.89/98,959.62 = 39,879.09/x
  3. Step 3: Cross multiply
    71,710.89x = 98,959.62 × 39,879.09
  4. Step 4: Simplify right side
    71,710.89x = 3,946,419,592.35
  5. Step 5: Solve for x
    x = 3,946,419,592.35/71,710.89
  6. Step 6: Final answer
    x = 55,032.36

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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.