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Finding the Fourth Proportional to 78,753.97, 117,999.45 and 55,338.49

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Solution

The fourth proportional to 78,753.97, 117,999.45 and 55,338.49 is: 82,915.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,753.97 : 117,999.45 = 55,338.49 : x
  2. Step 2: Convert to fraction form
    78,753.97/117,999.45 = 55,338.49/x
  3. Step 3: Cross multiply
    78,753.97x = 117,999.45 × 55,338.49
  4. Step 4: Simplify right side
    78,753.97x = 6,529,911,383.83
  5. Step 5: Solve for x
    x = 6,529,911,383.83/78,753.97
  6. Step 6: Final answer
    x = 82,915.33

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.