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Finding the Fourth Proportional to 214.28, 321.12 and 137.12

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Solution

The fourth proportional to 214.28, 321.12 and 137.12 is: 205.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    214.28 : 321.12 = 137.12 : x
  2. Step 2: Convert to fraction form
    214.28/321.12 = 137.12/x
  3. Step 3: Cross multiply
    214.28x = 321.12 × 137.12
  4. Step 4: Simplify right side
    214.28x = 44,031.97
  5. Step 5: Solve for x
    x = 44,031.97/214.28
  6. Step 6: Final answer
    x = 205.49

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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.