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Finding the Fourth Proportional to 171.09, 235.67 and 121.88

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Solution

The fourth proportional to 171.09, 235.67 and 121.88 is: 167.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    171.09 : 235.67 = 121.88 : x
  2. Step 2: Convert to fraction form
    171.09/235.67 = 121.88/x
  3. Step 3: Cross multiply
    171.09x = 235.67 × 121.88
  4. Step 4: Simplify right side
    171.09x = 28,723.63
  5. Step 5: Solve for x
    x = 28,723.63/171.09
  6. Step 6: Final answer
    x = 167.89

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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.