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Finding the Fourth Proportional to 80,811.28, 121,212.60 and 28,219.60

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Solution

The fourth proportional to 80,811.28, 121,212.60 and 28,219.60 is: 42,327.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,811.28 : 121,212.60 = 28,219.60 : x
  2. Step 2: Convert to fraction form
    80,811.28/121,212.60 = 28,219.60/x
  3. Step 3: Cross multiply
    80,811.28x = 121,212.60 × 28,219.60
  4. Step 4: Simplify right side
    80,811.28x = 3,420,571,086.96
  5. Step 5: Solve for x
    x = 3,420,571,086.96/80,811.28
  6. Step 6: Final answer
    x = 42,327.89

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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.