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Finding the Fourth Proportional to 214.72, 321.84 and 137.68

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Solution

The fourth proportional to 214.72, 321.84 and 137.68 is: 206.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    214.72 : 321.84 = 137.68 : x
  2. Step 2: Convert to fraction form
    214.72/321.84 = 137.68/x
  3. Step 3: Cross multiply
    214.72x = 321.84 × 137.68
  4. Step 4: Simplify right side
    214.72x = 44,310.93
  5. Step 5: Solve for x
    x = 44,310.93/214.72
  6. Step 6: Final answer
    x = 206.37

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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.