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Finding the Fourth Proportional to 344.45, 516.73 and 138.92

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Solution

The fourth proportional to 344.45, 516.73 and 138.92 is: 208.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    344.45 : 516.73 = 138.92 : x
  2. Step 2: Convert to fraction form
    344.45/516.73 = 138.92/x
  3. Step 3: Cross multiply
    344.45x = 516.73 × 138.92
  4. Step 4: Simplify right side
    344.45x = 71,781.46
  5. Step 5: Solve for x
    x = 71,781.46/344.45
  6. Step 6: Final answer
    x = 208.39

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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.