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Finding the Fourth Proportional to 170.38, 255.49 and 121.61

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Solution

The fourth proportional to 170.38, 255.49 and 121.61 is: 182.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    170.38 : 255.49 = 121.61 : x
  2. Step 2: Convert to fraction form
    170.38/255.49 = 121.61/x
  3. Step 3: Cross multiply
    170.38x = 255.49 × 121.61
  4. Step 4: Simplify right side
    170.38x = 31,070.14
  5. Step 5: Solve for x
    x = 31,070.14/170.38
  6. Step 6: Final answer
    x = 182.36

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.