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Finding the Fourth Proportional to 217,891.43, 300,720.44 and 122,405.39

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Solution

The fourth proportional to 217,891.43, 300,720.44 and 122,405.39 is: 168,936.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    217,891.43 : 300,720.44 = 122,405.39 : x
  2. Step 2: Convert to fraction form
    217,891.43/300,720.44 = 122,405.39/x
  3. Step 3: Cross multiply
    217,891.43x = 300,720.44 × 122,405.39
  4. Step 4: Simplify right side
    217,891.43x = 36,809,802,739.17
  5. Step 5: Solve for x
    x = 36,809,802,739.17/217,891.43
  6. Step 6: Final answer
    x = 168,936.44

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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.