Home / 20,382.43-28,115.83-12,816.78

Finding the Fourth Proportional to 20,382.43, 28,115.83 and 12,816.78

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Solution

The fourth proportional to 20,382.43, 28,115.83 and 12,816.78 is: 17,679.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,382.43 : 28,115.83 = 12,816.78 : x
  2. Step 2: Convert to fraction form
    20,382.43/28,115.83 = 12,816.78/x
  3. Step 3: Cross multiply
    20,382.43x = 28,115.83 × 12,816.78
  4. Step 4: Simplify right side
    20,382.43x = 360,354,202.96
  5. Step 5: Solve for x
    x = 360,354,202.96/20,382.43
  6. Step 6: Final answer
    x = 17,679.65

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.