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Finding the Fourth Proportional to 78,475.60, 117,540.60 and 68,107.60

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Solution

The fourth proportional to 78,475.60, 117,540.60 and 68,107.60 is: 102,011.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,475.60 : 117,540.60 = 68,107.60 : x
  2. Step 2: Convert to fraction form
    78,475.60/117,540.60 = 68,107.60/x
  3. Step 3: Cross multiply
    78,475.60x = 117,540.60 × 68,107.60
  4. Step 4: Simplify right side
    78,475.60x = 8,005,408,168.56
  5. Step 5: Solve for x
    x = 8,005,408,168.56/78,475.60
  6. Step 6: Final answer
    x = 102,011.43

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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.