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Finding the Fourth Proportional to 168.09, 251.81 and 99.41

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Solution

The fourth proportional to 168.09, 251.81 and 99.41 is: 148.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    168.09 : 251.81 = 99.41 : x
  2. Step 2: Convert to fraction form
    168.09/251.81 = 99.41/x
  3. Step 3: Cross multiply
    168.09x = 251.81 × 99.41
  4. Step 4: Simplify right side
    168.09x = 25,031.17
  5. Step 5: Solve for x
    x = 25,031.17/168.09
  6. Step 6: Final answer
    x = 148.92

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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.