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Finding the Fourth Proportional to 168.68, 251.78 and 156.64

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Solution

The fourth proportional to 168.68, 251.78 and 156.64 is: 233.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    168.68 : 251.78 = 156.64 : x
  2. Step 2: Convert to fraction form
    168.68/251.78 = 156.64/x
  3. Step 3: Cross multiply
    168.68x = 251.78 × 156.64
  4. Step 4: Simplify right side
    168.68x = 39,438.82
  5. Step 5: Solve for x
    x = 39,438.82/168.68
  6. Step 6: Final answer
    x = 233.81

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.