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Finding the Fourth Proportional to 78,229.92, 107,963.43 and 66,063.36

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Solution

The fourth proportional to 78,229.92, 107,963.43 and 66,063.36 is: 91,172.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,229.92 : 107,963.43 = 66,063.36 : x
  2. Step 2: Convert to fraction form
    78,229.92/107,963.43 = 66,063.36/x
  3. Step 3: Cross multiply
    78,229.92x = 107,963.43 × 66,063.36
  4. Step 4: Simplify right side
    78,229.92x = 7,132,426,942.92
  5. Step 5: Solve for x
    x = 7,132,426,942.92/78,229.92
  6. Step 6: Final answer
    x = 91,172.62

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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.