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Finding the Fourth Proportional to 170.45, 255.65 and 82.55

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Solution

The fourth proportional to 170.45, 255.65 and 82.55 is: 123.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    170.45 : 255.65 = 82.55 : x
  2. Step 2: Convert to fraction form
    170.45/255.65 = 82.55/x
  3. Step 3: Cross multiply
    170.45x = 255.65 × 82.55
  4. Step 4: Simplify right side
    170.45x = 21,103.91
  5. Step 5: Solve for x
    x = 21,103.91/170.45
  6. Step 6: Final answer
    x = 123.81

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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.