Home / 279,986.10-419,979.15-80,288.70

Finding the Fourth Proportional to 279,986.10, 419,979.15 and 80,288.70

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Solution

The fourth proportional to 279,986.10, 419,979.15 and 80,288.70 is: 120,433.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    279,986.10 : 419,979.15 = 80,288.70 : x
  2. Step 2: Convert to fraction form
    279,986.10/419,979.15 = 80,288.70/x
  3. Step 3: Cross multiply
    279,986.10x = 419,979.15 × 80,288.70
  4. Step 4: Simplify right side
    279,986.10x = 33,719,579,980.61
  5. Step 5: Solve for x
    x = 33,719,579,980.61/279,986.10
  6. Step 6: Final answer
    x = 120,433.05

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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.