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Finding the Fourth Proportional to 386.28, 579.46 and 126.31

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Solution

The fourth proportional to 386.28, 579.46 and 126.31 is: 189.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.28 : 579.46 = 126.31 : x
  2. Step 2: Convert to fraction form
    386.28/579.46 = 126.31/x
  3. Step 3: Cross multiply
    386.28x = 579.46 × 126.31
  4. Step 4: Simplify right side
    386.28x = 73,190.62
  5. Step 5: Solve for x
    x = 73,190.62/386.28
  6. Step 6: Final answer
    x = 189.48

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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.