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Finding the Fourth Proportional to 78,489.60, 117,561.60 and 68,121.60

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Solution

The fourth proportional to 78,489.60, 117,561.60 and 68,121.60 is: 102,032.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,489.60 : 117,561.60 = 68,121.60 : x
  2. Step 2: Convert to fraction form
    78,489.60/117,561.60 = 68,121.60/x
  3. Step 3: Cross multiply
    78,489.60x = 117,561.60 × 68,121.60
  4. Step 4: Simplify right side
    78,489.60x = 8,008,484,290.56
  5. Step 5: Solve for x
    x = 8,008,484,290.56/78,489.60
  6. Step 6: Final answer
    x = 102,032.43

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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.