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Finding the Fourth Proportional to 645.44, 969.48 and 426.38

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Solution

The fourth proportional to 645.44, 969.48 and 426.38 is: 640.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    645.44 : 969.48 = 426.38 : x
  2. Step 2: Convert to fraction form
    645.44/969.48 = 426.38/x
  3. Step 3: Cross multiply
    645.44x = 969.48 × 426.38
  4. Step 4: Simplify right side
    645.44x = 413,366.88
  5. Step 5: Solve for x
    x = 413,366.88/645.44
  6. Step 6: Final answer
    x = 640.44

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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.