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Finding the Fourth Proportional to 171.83, 236.63 and 128.09

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Solution

The fourth proportional to 171.83, 236.63 and 128.09 is: 176.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    171.83 : 236.63 = 128.09 : x
  2. Step 2: Convert to fraction form
    171.83/236.63 = 128.09/x
  3. Step 3: Cross multiply
    171.83x = 236.63 × 128.09
  4. Step 4: Simplify right side
    171.83x = 30,309.30
  5. Step 5: Solve for x
    x = 30,309.30/171.83
  6. Step 6: Final answer
    x = 176.39

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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.