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Finding the Fourth Proportional to 78,404.80, 117,520.80 and 43,369.60

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Solution

The fourth proportional to 78,404.80, 117,520.80 and 43,369.60 is: 65,006.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,404.80 : 117,520.80 = 43,369.60 : x
  2. Step 2: Convert to fraction form
    78,404.80/117,520.80 = 43,369.60/x
  3. Step 3: Cross multiply
    78,404.80x = 117,520.80 × 43,369.60
  4. Step 4: Simplify right side
    78,404.80x = 5,096,830,087.68
  5. Step 5: Solve for x
    x = 5,096,830,087.68/78,404.80
  6. Step 6: Final answer
    x = 65,006.61

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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.