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Finding the Fourth Proportional to 82,408.80, 123,872.40 and 80,853.60

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Solution

The fourth proportional to 82,408.80, 123,872.40 and 80,853.60 is: 121,534.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    82,408.80 : 123,872.40 = 80,853.60 : x
  2. Step 2: Convert to fraction form
    82,408.80/123,872.40 = 80,853.60/x
  3. Step 3: Cross multiply
    82,408.80x = 123,872.40 × 80,853.60
  4. Step 4: Simplify right side
    82,408.80x = 10,015,529,480.64
  5. Step 5: Solve for x
    x = 10,015,529,480.64/82,408.80
  6. Step 6: Final answer
    x = 121,534.71

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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.