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Finding the Fourth Proportional to 78,375.60, 117,390.60 and 68,007.60

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Solution

The fourth proportional to 78,375.60, 117,390.60 and 68,007.60 is: 101,861.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,375.60 : 117,390.60 = 68,007.60 : x
  2. Step 2: Convert to fraction form
    78,375.60/117,390.60 = 68,007.60/x
  3. Step 3: Cross multiply
    78,375.60x = 117,390.60 × 68,007.60
  4. Step 4: Simplify right side
    78,375.60x = 7,983,452,968.56
  5. Step 5: Solve for x
    x = 7,983,452,968.56/78,375.60
  6. Step 6: Final answer
    x = 101,861.46

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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.