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Finding the Fourth Proportional to 207.14, 287.21 and 196.20

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Solution

The fourth proportional to 207.14, 287.21 and 196.20 is: 272.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    207.14 : 287.21 = 196.20 : x
  2. Step 2: Convert to fraction form
    207.14/287.21 = 196.20/x
  3. Step 3: Cross multiply
    207.14x = 287.21 × 196.20
  4. Step 4: Simplify right side
    207.14x = 56,349.62
  5. Step 5: Solve for x
    x = 56,349.62/207.14
  6. Step 6: Final answer
    x = 272.04

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.