Home / 20,138.49-27,789.89-11,185.43

Finding the Fourth Proportional to 20,138.49, 27,789.89 and 11,185.43

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Solution

The fourth proportional to 20,138.49, 27,789.89 and 11,185.43 is: 15,435.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,138.49 : 27,789.89 = 11,185.43 : x
  2. Step 2: Convert to fraction form
    20,138.49/27,789.89 = 11,185.43/x
  3. Step 3: Cross multiply
    20,138.49x = 27,789.89 × 11,185.43
  4. Step 4: Simplify right side
    20,138.49x = 310,841,674.43
  5. Step 5: Solve for x
    x = 310,841,674.43/20,138.49
  6. Step 6: Final answer
    x = 15,435.20

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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.