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Finding the Fourth Proportional to 170.57, 255.86 and 74.38

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Solution

The fourth proportional to 170.57, 255.86 and 74.38 is: 111.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    170.57 : 255.86 = 74.38 : x
  2. Step 2: Convert to fraction form
    170.57/255.86 = 74.38/x
  3. Step 3: Cross multiply
    170.57x = 255.86 × 74.38
  4. Step 4: Simplify right side
    170.57x = 19,029.22
  5. Step 5: Solve for x
    x = 19,029.22/170.57
  6. Step 6: Final answer
    x = 111.57

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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.