Home / 80,990.30-121,540.20-28,400.24

Finding the Fourth Proportional to 80,990.30, 121,540.20 and 28,400.24

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Solution

The fourth proportional to 80,990.30, 121,540.20 and 28,400.24 is: 42,619.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,990.30 : 121,540.20 = 28,400.24 : x
  2. Step 2: Convert to fraction form
    80,990.30/121,540.20 = 28,400.24/x
  3. Step 3: Cross multiply
    80,990.30x = 121,540.20 × 28,400.24
  4. Step 4: Simplify right side
    80,990.30x = 3,451,770,849.65
  5. Step 5: Solve for x
    x = 3,451,770,849.65/80,990.30
  6. Step 6: Final answer
    x = 42,619.56

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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.