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Finding the Fourth Proportional to 170.42, 255.45 and 79.09

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Solution

The fourth proportional to 170.42, 255.45 and 79.09 is: 118.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    170.42 : 255.45 = 79.09 : x
  2. Step 2: Convert to fraction form
    170.42/255.45 = 79.09/x
  3. Step 3: Cross multiply
    170.42x = 255.45 × 79.09
  4. Step 4: Simplify right side
    170.42x = 20,204.64
  5. Step 5: Solve for x
    x = 20,204.64/170.42
  6. Step 6: Final answer
    x = 118.56

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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.