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Finding the Fourth Proportional to 71,712.41, 98,963.22 and 39,881.31

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Solution

The fourth proportional to 71,712.41, 98,963.22 and 39,881.31 is: 55,036.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,712.41 : 98,963.22 = 39,881.31 : x
  2. Step 2: Convert to fraction form
    71,712.41/98,963.22 = 39,881.31/x
  3. Step 3: Cross multiply
    71,712.41x = 98,963.22 × 39,881.31
  4. Step 4: Simplify right side
    71,712.41x = 3,946,782,577.78
  5. Step 5: Solve for x
    x = 3,946,782,577.78/71,712.41
  6. Step 6: Final answer
    x = 55,036.26

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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.