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Finding the Fourth Proportional to 645.38, 890.25 and 396.26

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Solution

The fourth proportional to 645.38, 890.25 and 396.26 is: 546.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    645.38 : 890.25 = 396.26 : x
  2. Step 2: Convert to fraction form
    645.38/890.25 = 396.26/x
  3. Step 3: Cross multiply
    645.38x = 890.25 × 396.26
  4. Step 4: Simplify right side
    645.38x = 352,766.01
  5. Step 5: Solve for x
    x = 352,766.01/645.38
  6. Step 6: Final answer
    x = 546.61

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.