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Finding the Fourth Proportional to 218.55, 328 and 121.14

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Solution

The fourth proportional to 218.55, 328 and 121.14 is: 181.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.55 : 328 = 121.14 : x
  2. Step 2: Convert to fraction form
    218.55/328 = 121.14/x
  3. Step 3: Cross multiply
    218.55x = 328 × 121.14
  4. Step 4: Simplify right side
    218.55x = 39,732.28
  5. Step 5: Solve for x
    x = 39,732.28/218.55
  6. Step 6: Final answer
    x = 181.80

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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.