Home / 54,138.43-81,186.13-20,840.05

Finding the Fourth Proportional to 54,138.43, 81,186.13 and 20,840.05

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Solution

The fourth proportional to 54,138.43, 81,186.13 and 20,840.05 is: 31,251.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    54,138.43 : 81,186.13 = 20,840.05 : x
  2. Step 2: Convert to fraction form
    54,138.43/81,186.13 = 20,840.05/x
  3. Step 3: Cross multiply
    54,138.43x = 81,186.13 × 20,840.05
  4. Step 4: Simplify right side
    54,138.43x = 1,691,923,008.51
  5. Step 5: Solve for x
    x = 1,691,923,008.51/54,138.43
  6. Step 6: Final answer
    x = 31,251.79

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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.