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Finding the Fourth Proportional to 168, 251.92 and 86.88

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Solution

The fourth proportional to 168, 251.92 and 86.88 is: 130.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    168 : 251.92 = 86.88 : x
  2. Step 2: Convert to fraction form
    168/251.92 = 86.88/x
  3. Step 3: Cross multiply
    168x = 251.92 × 86.88
  4. Step 4: Simplify right side
    168x = 21,886.81
  5. Step 5: Solve for x
    x = 21,886.81/168
  6. Step 6: Final answer
    x = 130.28

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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.