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Finding the Fourth Proportional to 170.28, 255.40 and 83.59

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Solution

The fourth proportional to 170.28, 255.40 and 83.59 is: 125.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    170.28 : 255.40 = 83.59 : x
  2. Step 2: Convert to fraction form
    170.28/255.40 = 83.59/x
  3. Step 3: Cross multiply
    170.28x = 255.40 × 83.59
  4. Step 4: Simplify right side
    170.28x = 21,348.89
  5. Step 5: Solve for x
    x = 21,348.89/170.28
  6. Step 6: Final answer
    x = 125.38

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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.