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Finding the Fourth Proportional to 78,544.80, 117,622.80 and 50,421.60

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Solution

The fourth proportional to 78,544.80, 117,622.80 and 50,421.60 is: 75,507.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,544.80 : 117,622.80 = 50,421.60 : x
  2. Step 2: Convert to fraction form
    78,544.80/117,622.80 = 50,421.60/x
  3. Step 3: Cross multiply
    78,544.80x = 117,622.80 × 50,421.60
  4. Step 4: Simplify right side
    78,544.80x = 5,930,729,772.48
  5. Step 5: Solve for x
    x = 5,930,729,772.48/78,544.80
  6. Step 6: Final answer
    x = 75,507.61

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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.