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Finding the Fourth Proportional to 386.97, 580.50 and 126.90

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Solution

The fourth proportional to 386.97, 580.50 and 126.90 is: 190.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.97 : 580.50 = 126.90 : x
  2. Step 2: Convert to fraction form
    386.97/580.50 = 126.90/x
  3. Step 3: Cross multiply
    386.97x = 580.50 × 126.90
  4. Step 4: Simplify right side
    386.97x = 73,667.44
  5. Step 5: Solve for x
    x = 73,667.44/386.97
  6. Step 6: Final answer
    x = 190.37

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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.