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Finding the Fourth Proportional to 168.78, 251.71 and 147.22

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Solution

The fourth proportional to 168.78, 251.71 and 147.22 is: 219.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    168.78 : 251.71 = 147.22 : x
  2. Step 2: Convert to fraction form
    168.78/251.71 = 147.22/x
  3. Step 3: Cross multiply
    168.78x = 251.71 × 147.22
  4. Step 4: Simplify right side
    168.78x = 37,055.75
  5. Step 5: Solve for x
    x = 37,055.75/168.78
  6. Step 6: Final answer
    x = 219.55

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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.