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Finding the Fourth Proportional to 168.18, 251.93 and 86.88

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Solution

The fourth proportional to 168.18, 251.93 and 86.88 is: 130.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    168.18 : 251.93 = 86.88 : x
  2. Step 2: Convert to fraction form
    168.18/251.93 = 86.88/x
  3. Step 3: Cross multiply
    168.18x = 251.93 × 86.88
  4. Step 4: Simplify right side
    168.18x = 21,887.68
  5. Step 5: Solve for x
    x = 21,887.68/168.18
  6. Step 6: Final answer
    x = 130.14

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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.