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Finding the Fourth Proportional to 386.39, 579.56 and 126.56

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Solution

The fourth proportional to 386.39, 579.56 and 126.56 is: 189.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.39 : 579.56 = 126.56 : x
  2. Step 2: Convert to fraction form
    386.39/579.56 = 126.56/x
  3. Step 3: Cross multiply
    386.39x = 579.56 × 126.56
  4. Step 4: Simplify right side
    386.39x = 73,345.58
  5. Step 5: Solve for x
    x = 73,345.58/386.39
  6. Step 6: Final answer
    x = 189.83

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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.