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Finding the Fourth Proportional to 71,721.72, 98,980.92 and 39,893.58

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Solution

The fourth proportional to 71,721.72, 98,980.92 and 39,893.58 is: 55,055.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,721.72 : 98,980.92 = 39,893.58 : x
  2. Step 2: Convert to fraction form
    71,721.72/98,980.92 = 39,893.58/x
  3. Step 3: Cross multiply
    71,721.72x = 98,980.92 × 39,893.58
  4. Step 4: Simplify right side
    71,721.72x = 3,948,703,250.49
  5. Step 5: Solve for x
    x = 3,948,703,250.49/71,721.72
  6. Step 6: Final answer
    x = 55,055.89

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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.