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Finding the Fourth Proportional to 344.47, 516.54 and 138.98

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Solution

The fourth proportional to 344.47, 516.54 and 138.98 is: 208.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    344.47 : 516.54 = 138.98 : x
  2. Step 2: Convert to fraction form
    344.47/516.54 = 138.98/x
  3. Step 3: Cross multiply
    344.47x = 516.54 × 138.98
  4. Step 4: Simplify right side
    344.47x = 71,788.73
  5. Step 5: Solve for x
    x = 71,788.73/344.47
  6. Step 6: Final answer
    x = 208.40

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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.