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Finding the Fourth Proportional to 386.09, 579.21 and 126.13

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Solution

The fourth proportional to 386.09, 579.21 and 126.13 is: 189.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.09 : 579.21 = 126.13 : x
  2. Step 2: Convert to fraction form
    386.09/579.21 = 126.13/x
  3. Step 3: Cross multiply
    386.09x = 579.21 × 126.13
  4. Step 4: Simplify right side
    386.09x = 73,052.86
  5. Step 5: Solve for x
    x = 73,052.86/386.09
  6. Step 6: Final answer
    x = 189.21

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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.