Home / 20,215.38-27,887.66-13,139.22

Finding the Fourth Proportional to 20,215.38, 27,887.66 and 13,139.22

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Solution

The fourth proportional to 20,215.38, 27,887.66 and 13,139.22 is: 18,125.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,215.38 : 27,887.66 = 13,139.22 : x
  2. Step 2: Convert to fraction form
    20,215.38/27,887.66 = 13,139.22/x
  3. Step 3: Cross multiply
    20,215.38x = 27,887.66 × 13,139.22
  4. Step 4: Simplify right side
    20,215.38x = 366,422,100.03
  5. Step 5: Solve for x
    x = 366,422,100.03/20,215.38
  6. Step 6: Final answer
    x = 18,125.91

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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.