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Finding the Fourth Proportional to 345.69, 518.45 and 126.28

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Solution

The fourth proportional to 345.69, 518.45 and 126.28 is: 189.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    345.69 : 518.45 = 126.28 : x
  2. Step 2: Convert to fraction form
    345.69/518.45 = 126.28/x
  3. Step 3: Cross multiply
    345.69x = 518.45 × 126.28
  4. Step 4: Simplify right side
    345.69x = 65,469.87
  5. Step 5: Solve for x
    x = 65,469.87/345.69
  6. Step 6: Final answer
    x = 189.39

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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.