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Finding the Fourth Proportional to 427.26, 640.33 and 170.46

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Solution

The fourth proportional to 427.26, 640.33 and 170.46 is: 255.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    427.26 : 640.33 = 170.46 : x
  2. Step 2: Convert to fraction form
    427.26/640.33 = 170.46/x
  3. Step 3: Cross multiply
    427.26x = 640.33 × 170.46
  4. Step 4: Simplify right side
    427.26x = 109,150.65
  5. Step 5: Solve for x
    x = 109,150.65/427.26
  6. Step 6: Final answer
    x = 255.47

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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.