Home / 20,318.80-28,036.32-11,819.71

Finding the Fourth Proportional to 20,318.80, 28,036.32 and 11,819.71

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Solution

The fourth proportional to 20,318.80, 28,036.32 and 11,819.71 is: 16,309.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,318.80 : 28,036.32 = 11,819.71 : x
  2. Step 2: Convert to fraction form
    20,318.80/28,036.32 = 11,819.71/x
  3. Step 3: Cross multiply
    20,318.80x = 28,036.32 × 11,819.71
  4. Step 4: Simplify right side
    20,318.80x = 331,381,171.87
  5. Step 5: Solve for x
    x = 331,381,171.87/20,318.80
  6. Step 6: Final answer
    x = 16,309.09

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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.