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Finding the Fourth Proportional to 208.39, 287.39 and 171.33

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Solution

The fourth proportional to 208.39, 287.39 and 171.33 is: 236.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    208.39 : 287.39 = 171.33 : x
  2. Step 2: Convert to fraction form
    208.39/287.39 = 171.33/x
  3. Step 3: Cross multiply
    208.39x = 287.39 × 171.33
  4. Step 4: Simplify right side
    208.39x = 49,238.96
  5. Step 5: Solve for x
    x = 49,238.96/208.39
  6. Step 6: Final answer
    x = 236.29

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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.