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Finding the Fourth Proportional to 214.60, 321.90 and 206.20

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Solution

The fourth proportional to 214.60, 321.90 and 206.20 is: 309.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    214.60 : 321.90 = 206.20 : x
  2. Step 2: Convert to fraction form
    214.60/321.90 = 206.20/x
  3. Step 3: Cross multiply
    214.60x = 321.90 × 206.20
  4. Step 4: Simplify right side
    214.60x = 66,375.78
  5. Step 5: Solve for x
    x = 66,375.78/214.60
  6. Step 6: Final answer
    x = 309.30

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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.