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Finding the Fourth Proportional to 80,861.20, 121,291.80 and 45,431.80

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Solution

The fourth proportional to 80,861.20, 121,291.80 and 45,431.80 is: 68,147.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,861.20 : 121,291.80 = 45,431.80 : x
  2. Step 2: Convert to fraction form
    80,861.20/121,291.80 = 45,431.80/x
  3. Step 3: Cross multiply
    80,861.20x = 121,291.80 × 45,431.80
  4. Step 4: Simplify right side
    80,861.20x = 5,510,504,799.24
  5. Step 5: Solve for x
    x = 5,510,504,799.24/80,861.20
  6. Step 6: Final answer
    x = 68,147.70

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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.