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Finding the Fourth Proportional to 344.31, 516.27 and 138.72

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Solution

The fourth proportional to 344.31, 516.27 and 138.72 is: 208.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    344.31 : 516.27 = 138.72 : x
  2. Step 2: Convert to fraction form
    344.31/516.27 = 138.72/x
  3. Step 3: Cross multiply
    344.31x = 516.27 × 138.72
  4. Step 4: Simplify right side
    344.31x = 71,616.97
  5. Step 5: Solve for x
    x = 71,616.97/344.31
  6. Step 6: Final answer
    x = 208.00

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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.