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Finding the Fourth Proportional to 214.12, 321.72 and 207.64

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Solution

The fourth proportional to 214.12, 321.72 and 207.64 is: 311.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    214.12 : 321.72 = 207.64 : x
  2. Step 2: Convert to fraction form
    214.12/321.72 = 207.64/x
  3. Step 3: Cross multiply
    214.12x = 321.72 × 207.64
  4. Step 4: Simplify right side
    214.12x = 66,801.94
  5. Step 5: Solve for x
    x = 66,801.94/214.12
  6. Step 6: Final answer
    x = 311.98

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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.