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Finding the Fourth Proportional to 386.92, 580.35 and 126.91

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Solution

The fourth proportional to 386.92, 580.35 and 126.91 is: 190.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.92 : 580.35 = 126.91 : x
  2. Step 2: Convert to fraction form
    386.92/580.35 = 126.91/x
  3. Step 3: Cross multiply
    386.92x = 580.35 × 126.91
  4. Step 4: Simplify right side
    386.92x = 73,652.22
  5. Step 5: Solve for x
    x = 73,652.22/386.92
  6. Step 6: Final answer
    x = 190.36

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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.