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Finding the Fourth Proportional to 171.78, 236.85 and 151.26

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Solution

The fourth proportional to 171.78, 236.85 and 151.26 is: 208.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    171.78 : 236.85 = 151.26 : x
  2. Step 2: Convert to fraction form
    171.78/236.85 = 151.26/x
  3. Step 3: Cross multiply
    171.78x = 236.85 × 151.26
  4. Step 4: Simplify right side
    171.78x = 35,825.93
  5. Step 5: Solve for x
    x = 35,825.93/171.78
  6. Step 6: Final answer
    x = 208.56

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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.