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Finding the Fourth Proportional to 71,517.52, 98,705.91 and 39,696.64

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Solution

The fourth proportional to 71,517.52, 98,705.91 and 39,696.64 is: 54,787.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,517.52 : 98,705.91 = 39,696.64 : x
  2. Step 2: Convert to fraction form
    71,517.52/98,705.91 = 39,696.64/x
  3. Step 3: Cross multiply
    71,517.52x = 98,705.91 × 39,696.64
  4. Step 4: Simplify right side
    71,517.52x = 3,918,292,975.14
  5. Step 5: Solve for x
    x = 3,918,292,975.14/71,517.52
  6. Step 6: Final answer
    x = 54,787.88

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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.