Home / 21,012.82-28,998.30-11,581.99

Finding the Fourth Proportional to 21,012.82, 28,998.30 and 11,581.99

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Solution

The fourth proportional to 21,012.82, 28,998.30 and 11,581.99 is: 15,983.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,012.82 : 28,998.30 = 11,581.99 : x
  2. Step 2: Convert to fraction form
    21,012.82/28,998.30 = 11,581.99/x
  3. Step 3: Cross multiply
    21,012.82x = 28,998.30 × 11,581.99
  4. Step 4: Simplify right side
    21,012.82x = 335,858,020.62
  5. Step 5: Solve for x
    x = 335,858,020.62/21,012.82
  6. Step 6: Final answer
    x = 15,983.48

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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.