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Finding the Fourth Proportional to 78,136.64, 117,081.87 and 60,410.60

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Solution

The fourth proportional to 78,136.64, 117,081.87 and 60,410.60 is: 90,520.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,136.64 : 117,081.87 = 60,410.60 : x
  2. Step 2: Convert to fraction form
    78,136.64/117,081.87 = 60,410.60/x
  3. Step 3: Cross multiply
    78,136.64x = 117,081.87 × 60,410.60
  4. Step 4: Simplify right side
    78,136.64x = 7,072,986,015.82
  5. Step 5: Solve for x
    x = 7,072,986,015.82/78,136.64
  6. Step 6: Final answer
    x = 90,520.73

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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.