Home / 80,979.20-121,379.70-28,361.60

Finding the Fourth Proportional to 80,979.20, 121,379.70 and 28,361.60

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Solution

The fourth proportional to 80,979.20, 121,379.70 and 28,361.60 is: 42,511.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,979.20 : 121,379.70 = 28,361.60 : x
  2. Step 2: Convert to fraction form
    80,979.20/121,379.70 = 28,361.60/x
  3. Step 3: Cross multiply
    80,979.20x = 121,379.70 × 28,361.60
  4. Step 4: Simplify right side
    80,979.20x = 3,442,522,499.52
  5. Step 5: Solve for x
    x = 3,442,522,499.52/80,979.20
  6. Step 6: Final answer
    x = 42,511.19

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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.