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Finding the Fourth Proportional to 344.22, 516.21 and 138.67

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Solution

The fourth proportional to 344.22, 516.21 and 138.67 is: 207.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    344.22 : 516.21 = 138.67 : x
  2. Step 2: Convert to fraction form
    344.22/516.21 = 138.67/x
  3. Step 3: Cross multiply
    344.22x = 516.21 × 138.67
  4. Step 4: Simplify right side
    344.22x = 71,582.84
  5. Step 5: Solve for x
    x = 71,582.84/344.22
  6. Step 6: Final answer
    x = 207.96

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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.