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Finding the Fourth Proportional to 81,704.80, 122,557.20 and 81,121.60

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Solution

The fourth proportional to 81,704.80, 122,557.20 and 81,121.60 is: 121,682.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,704.80 : 122,557.20 = 81,121.60 : x
  2. Step 2: Convert to fraction form
    81,704.80/122,557.20 = 81,121.60/x
  3. Step 3: Cross multiply
    81,704.80x = 122,557.20 × 81,121.60
  4. Step 4: Simplify right side
    81,704.80x = 9,942,036,155.52
  5. Step 5: Solve for x
    x = 9,942,036,155.52/81,704.80
  6. Step 6: Final answer
    x = 121,682.40

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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.