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Finding the Fourth Proportional to 171.53, 236.97 and 128.42

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Solution

The fourth proportional to 171.53, 236.97 and 128.42 is: 177.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    171.53 : 236.97 = 128.42 : x
  2. Step 2: Convert to fraction form
    171.53/236.97 = 128.42/x
  3. Step 3: Cross multiply
    171.53x = 236.97 × 128.42
  4. Step 4: Simplify right side
    171.53x = 30,430.50
  5. Step 5: Solve for x
    x = 30,430.50/171.53
  6. Step 6: Final answer
    x = 177.41

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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.