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Finding the Fourth Proportional to 80,491.20, 120,736.80 and 60,662.40

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Solution

The fourth proportional to 80,491.20, 120,736.80 and 60,662.40 is: 90,993.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,491.20 : 120,736.80 = 60,662.40 : x
  2. Step 2: Convert to fraction form
    80,491.20/120,736.80 = 60,662.40/x
  3. Step 3: Cross multiply
    80,491.20x = 120,736.80 × 60,662.40
  4. Step 4: Simplify right side
    80,491.20x = 7,324,184,056.32
  5. Step 5: Solve for x
    x = 7,324,184,056.32/80,491.20
  6. Step 6: Final answer
    x = 90,993.60

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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.