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Finding the Fourth Proportional to 238.76, 357.86 and 84.64

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Solution

The fourth proportional to 238.76, 357.86 and 84.64 is: 126.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    238.76 : 357.86 = 84.64 : x
  2. Step 2: Convert to fraction form
    238.76/357.86 = 84.64/x
  3. Step 3: Cross multiply
    238.76x = 357.86 × 84.64
  4. Step 4: Simplify right side
    238.76x = 30,289.27
  5. Step 5: Solve for x
    x = 30,289.27/238.76
  6. Step 6: Final answer
    x = 126.86

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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.