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Finding the Fourth Proportional to 128,524.60, 192,786.90 and 81,285.40

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Solution

The fourth proportional to 128,524.60, 192,786.90 and 81,285.40 is: 121,928.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,524.60 : 192,786.90 = 81,285.40 : x
  2. Step 2: Convert to fraction form
    128,524.60/192,786.90 = 81,285.40/x
  3. Step 3: Cross multiply
    128,524.60x = 192,786.90 × 81,285.40
  4. Step 4: Simplify right side
    128,524.60x = 15,670,760,281.26
  5. Step 5: Solve for x
    x = 15,670,760,281.26/128,524.60
  6. Step 6: Final answer
    x = 121,928.10

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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.