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Finding the Fourth Proportional to 386, 579.06 and 129.56

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Solution

The fourth proportional to 386, 579.06 and 129.56 is: 194.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    386 : 579.06 = 129.56 : x
  2. Step 2: Convert to fraction form
    386/579.06 = 129.56/x
  3. Step 3: Cross multiply
    386x = 579.06 × 129.56
  4. Step 4: Simplify right side
    386x = 75,023.01
  5. Step 5: Solve for x
    x = 75,023.01/386
  6. Step 6: Final answer
    x = 194.36

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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.