Home / 20,138.31-27,790.09-11,186.38

Finding the Fourth Proportional to 20,138.31, 27,790.09 and 11,186.38

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Solution

The fourth proportional to 20,138.31, 27,790.09 and 11,186.38 is: 15,436.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,138.31 : 27,790.09 = 11,186.38 : x
  2. Step 2: Convert to fraction form
    20,138.31/27,790.09 = 11,186.38/x
  3. Step 3: Cross multiply
    20,138.31x = 27,790.09 × 11,186.38
  4. Step 4: Simplify right side
    20,138.31x = 310,870,506.97
  5. Step 5: Solve for x
    x = 310,870,506.97/20,138.31
  6. Step 6: Final answer
    x = 15,436.77

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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.