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Finding the Fourth Proportional to 238.28, 357.21 and 129.96

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Solution

The fourth proportional to 238.28, 357.21 and 129.96 is: 194.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    238.28 : 357.21 = 129.96 : x
  2. Step 2: Convert to fraction form
    238.28/357.21 = 129.96/x
  3. Step 3: Cross multiply
    238.28x = 357.21 × 129.96
  4. Step 4: Simplify right side
    238.28x = 46,423.01
  5. Step 5: Solve for x
    x = 46,423.01/238.28
  6. Step 6: Final answer
    x = 194.83

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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.