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Finding the Fourth Proportional to 168.21, 252.32 and 87.14

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Solution

The fourth proportional to 168.21, 252.32 and 87.14 is: 130.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    168.21 : 252.32 = 87.14 : x
  2. Step 2: Convert to fraction form
    168.21/252.32 = 87.14/x
  3. Step 3: Cross multiply
    168.21x = 252.32 × 87.14
  4. Step 4: Simplify right side
    168.21x = 21,987.36
  5. Step 5: Solve for x
    x = 21,987.36/168.21
  6. Step 6: Final answer
    x = 130.71

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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.