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Finding the Fourth Proportional to 81,959.60, 122,939.40 and 80,793.20

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Solution

The fourth proportional to 81,959.60, 122,939.40 and 80,793.20 is: 121,189.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,959.60 : 122,939.40 = 80,793.20 : x
  2. Step 2: Convert to fraction form
    81,959.60/122,939.40 = 80,793.20/x
  3. Step 3: Cross multiply
    81,959.60x = 122,939.40 × 80,793.20
  4. Step 4: Simplify right side
    81,959.60x = 9,932,667,532.08
  5. Step 5: Solve for x
    x = 9,932,667,532.08/81,959.60
  6. Step 6: Final answer
    x = 121,189.80

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1.5x scale

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.