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Finding the Fourth Proportional to 174.78, 241.20 and 115.80

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Solution

The fourth proportional to 174.78, 241.20 and 115.80 is: 159.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    174.78 : 241.20 = 115.80 : x
  2. Step 2: Convert to fraction form
    174.78/241.20 = 115.80/x
  3. Step 3: Cross multiply
    174.78x = 241.20 × 115.80
  4. Step 4: Simplify right side
    174.78x = 27,930.96
  5. Step 5: Solve for x
    x = 27,930.96/174.78
  6. Step 6: Final answer
    x = 159.81

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.