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Finding the Fourth Proportional to 209.05, 287.53 and 171.44

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Solution

The fourth proportional to 209.05, 287.53 and 171.44 is: 235.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.05 : 287.53 = 171.44 : x
  2. Step 2: Convert to fraction form
    209.05/287.53 = 171.44/x
  3. Step 3: Cross multiply
    209.05x = 287.53 × 171.44
  4. Step 4: Simplify right side
    209.05x = 49,292.28
  5. Step 5: Solve for x
    x = 49,292.28/209.05
  6. Step 6: Final answer
    x = 235.79

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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.