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Finding the Fourth Proportional to 386.45, 579.73 and 126.38

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Solution

The fourth proportional to 386.45, 579.73 and 126.38 is: 189.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.45 : 579.73 = 126.38 : x
  2. Step 2: Convert to fraction form
    386.45/579.73 = 126.38/x
  3. Step 3: Cross multiply
    386.45x = 579.73 × 126.38
  4. Step 4: Simplify right side
    386.45x = 73,267.65
  5. Step 5: Solve for x
    x = 73,267.65/386.45
  6. Step 6: Final answer
    x = 189.59

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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.