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Finding the Fourth Proportional to 168.48, 252.38 and 87.21

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Solution

The fourth proportional to 168.48, 252.38 and 87.21 is: 130.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    168.48 : 252.38 = 87.21 : x
  2. Step 2: Convert to fraction form
    168.48/252.38 = 87.21/x
  3. Step 3: Cross multiply
    168.48x = 252.38 × 87.21
  4. Step 4: Simplify right side
    168.48x = 22,009.62
  5. Step 5: Solve for x
    x = 22,009.62/168.48
  6. Step 6: Final answer
    x = 130.64

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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.