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Finding the Fourth Proportional to 170.63, 255.90 and 74.42

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Solution

The fourth proportional to 170.63, 255.90 and 74.42 is: 111.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    170.63 : 255.90 = 74.42 : x
  2. Step 2: Convert to fraction form
    170.63/255.90 = 74.42/x
  3. Step 3: Cross multiply
    170.63x = 255.90 × 74.42
  4. Step 4: Simplify right side
    170.63x = 19,044.08
  5. Step 5: Solve for x
    x = 19,044.08/170.63
  6. Step 6: Final answer
    x = 111.61

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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.