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Finding the Fourth Proportional to 80,309.70, 120,464.55 and 72,015.30

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Solution

The fourth proportional to 80,309.70, 120,464.55 and 72,015.30 is: 108,022.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,309.70 : 120,464.55 = 72,015.30 : x
  2. Step 2: Convert to fraction form
    80,309.70/120,464.55 = 72,015.30/x
  3. Step 3: Cross multiply
    80,309.70x = 120,464.55 × 72,015.30
  4. Step 4: Simplify right side
    80,309.70x = 8,675,290,707.62
  5. Step 5: Solve for x
    x = 8,675,290,707.62/80,309.70
  6. Step 6: Final answer
    x = 108,022.95

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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.