Home / 12,813.09-19,221.68-6,891.78

Finding the Fourth Proportional to 12,813.09, 19,221.68 and 6,891.78

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Solution

The fourth proportional to 12,813.09, 19,221.68 and 6,891.78 is: 10,338.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,813.09 : 19,221.68 = 6,891.78 : x
  2. Step 2: Convert to fraction form
    12,813.09/19,221.68 = 6,891.78/x
  3. Step 3: Cross multiply
    12,813.09x = 19,221.68 × 6,891.78
  4. Step 4: Simplify right side
    12,813.09x = 132,471,659.72
  5. Step 5: Solve for x
    x = 132,471,659.72/12,813.09
  6. Step 6: Final answer
    x = 10,338.78

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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.