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Finding the Fourth Proportional to 344.58, 516.90 and 139.26

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Solution

The fourth proportional to 344.58, 516.90 and 139.26 is: 208.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    344.58 : 516.90 = 139.26 : x
  2. Step 2: Convert to fraction form
    344.58/516.90 = 139.26/x
  3. Step 3: Cross multiply
    344.58x = 516.90 × 139.26
  4. Step 4: Simplify right side
    344.58x = 71,983.49
  5. Step 5: Solve for x
    x = 71,983.49/344.58
  6. Step 6: Final answer
    x = 208.90

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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.