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Finding the Fourth Proportional to 214.20, 321.10 and 84.12

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Solution

The fourth proportional to 214.20, 321.10 and 84.12 is: 126.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    214.20 : 321.10 = 84.12 : x
  2. Step 2: Convert to fraction form
    214.20/321.10 = 84.12/x
  3. Step 3: Cross multiply
    214.20x = 321.10 × 84.12
  4. Step 4: Simplify right side
    214.20x = 27,010.93
  5. Step 5: Solve for x
    x = 27,010.93/214.20
  6. Step 6: Final answer
    x = 126.10

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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.