Home / 80,996.24-121,449-28,385.12

Finding the Fourth Proportional to 80,996.24, 121,449 and 28,385.12

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Solution

The fourth proportional to 80,996.24, 121,449 and 28,385.12 is: 42,561.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,996.24 : 121,449 = 28,385.12 : x
  2. Step 2: Convert to fraction form
    80,996.24/121,449 = 28,385.12/x
  3. Step 3: Cross multiply
    80,996.24x = 121,449 × 28,385.12
  4. Step 4: Simplify right side
    80,996.24x = 3,447,344,438.88
  5. Step 5: Solve for x
    x = 3,447,344,438.88/80,996.24
  6. Step 6: Final answer
    x = 42,561.78

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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.