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Finding the Fourth Proportional to 54,168.69, 81,266.87 and 20,879.81

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Solution

The fourth proportional to 54,168.69, 81,266.87 and 20,879.81 is: 31,325.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    54,168.69 : 81,266.87 = 20,879.81 : x
  2. Step 2: Convert to fraction form
    54,168.69/81,266.87 = 20,879.81/x
  3. Step 3: Cross multiply
    54,168.69x = 81,266.87 × 20,879.81
  4. Step 4: Simplify right side
    54,168.69x = 1,696,837,039.63
  5. Step 5: Solve for x
    x = 1,696,837,039.63/54,168.69
  6. Step 6: Final answer
    x = 31,325.05

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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.