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Finding the Fourth Proportional to 218.35, 326.84 and 115.50

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Solution

The fourth proportional to 218.35, 326.84 and 115.50 is: 172.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.35 : 326.84 = 115.50 : x
  2. Step 2: Convert to fraction form
    218.35/326.84 = 115.50/x
  3. Step 3: Cross multiply
    218.35x = 326.84 × 115.50
  4. Step 4: Simplify right side
    218.35x = 37,749.44
  5. Step 5: Solve for x
    x = 37,749.44/218.35
  6. Step 6: Final answer
    x = 172.89

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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.